proxy, ui: add pending requests count to the main dashboard (#516)

add a real time counter of pending (inflight) requests to the UI.

.coderabbit.yaml

@@ -4,7 +4,7 @@ early_access: false
 reviews:
   profile: "chill"
   request_changes_workflow: false
-  high_level_summary: true
+  high_level_summary: false
   poem: false
   review_status: true
   collapse_walkthrough: false

.github/workflows/containers.yml

@@ -15,6 +15,14 @@ on:
     paths:
       - '.github/workflows/containers.yml'
       - 'docker/build-container.sh'
+      - 'docker/*.Containerfile'
+
+# grant permissions on GITHUB_TOKEN to publish packages
+# ref: https://docs.github.com/en/packages/managing-github-packages-using-github-actions-workflows/publishing-and-installing-a-package-with-github-actions#publishing-a-package-using-an-action
+permissions:
+  contents: read
+  packages: write
+  id-token: write
 
 jobs:
   build-and-push:

.github/workflows/go-ci-windows.yml

@@ -3,9 +3,25 @@ name: Windows CI
 on:
   push:
     branches: [ "main" ]
+    # only run when backend source changes
+    # cmd/ is excluded because it contains utilities without tests
+    paths:
+      - '**/*.go'
+      - '!cmd/**'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.github/workflows/go-ci-windows.yml'
 
   pull_request:
     branches: [ "main" ]
+    paths:
+      - '**/*.go'
+      - '!cmd/**'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.github/workflows/go-ci-windows.yml'
 
   # Allows manual triggering of the workflow
   workflow_dispatch:
@@ -28,7 +44,7 @@ jobs:
       uses: actions/cache/restore@v4
       with:
         path: ./build
-        key: ${{ runner.os }}-simple-responder-${{ hashFiles('misc/simple-responder/simple-responder.go') }}
+        key: ${{ runner.os }}-simple-responder-${{ hashFiles('cmd/simple-responder/simple-responder.go') }}
 
     # necessary for testing proxy/Process swapping
     - name: Create simple-responder
@@ -43,7 +59,7 @@ jobs:
       uses: actions/cache/save@v4
       with:
         path: ./build
-        key: ${{ runner.os }}-simple-responder-${{ hashFiles('misc/simple-responder/simple-responder.go') }}
+        key: ${{ runner.os }}-simple-responder-${{ hashFiles('cmd/simple-responder/simple-responder.go') }}
 
     - name: Test all
       shell: bash

.github/workflows/go-ci.yml

@@ -3,9 +3,25 @@ name: Linux CI
 on:
   push:
     branches: [ "main" ]
+    # only run when backend source changes
+    # cmd/ is excluded because it contains utilities without tests
+    paths:
+      - '**/*.go'
+      - '!cmd/**'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.github/workflows/go-ci.yml'
 
   pull_request:
     branches: [ "main" ]
+    paths:
+      - '**/*.go'
+      - '!cmd/**'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.github/workflows/go-ci.yml'
 
   # Allows manual triggering of the workflow
   workflow_dispatch:

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "23"
+          node-version: "24"
       - name: Install dependencies and build UI
         run: |
           cd ui-svelte

.github/workflows/ui-tests.yml

@@ -0,0 +1,42 @@
+name: UI Tests
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - 'ui-svelte/**'
+      - '.github/workflows/ui-tests.yml'
+
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - 'ui-svelte/**'
+      - '.github/workflows/ui-tests.yml'
+
+  workflow_dispatch:
+
+jobs:
+
+  run-tests:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ui-svelte
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '24'
+        cache: 'npm'
+        cache-dependency-path: ui-svelte/package-lock.json
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Type check
+      run: npm run check
+
+    - name: Run tests
+      run: npm test

AGENTS.md

@@ -0,0 +1,50 @@
+## Project Description:
+
+llama-swap is a light weight, transparent proxy server that provides automatic model swapping to llama.cpp's server.
+
+## Tech stack
+
+- golang
+- typescript, vite and svelt5 for UI (located in ui/)
+
+## Workflow Tasks
+
+- when summarizing changes only include details that require further action
+- just say "Done." when there is no further action
+- use the github CLI `gh` to create pull requests and work with github
+- Rules for creating pull requests:
+  - keep them short and focused on changes.
+  - never include a test plan
+  - write the summary using the same style rules as commit message
+
+## Testing
+
+- Follow test naming conventions like `TestProxyManager_<test name>`, `TestProcessGroup_<test name>`, etc.
+- Use `go test -v -run <name pattern for new tests>` to run any new tests you've written.
+- Use `make test-dev` after running new tests for a quick over all test run. This runs `go test` and `staticcheck`. Fix any static checking errors. Use this only when changes are made to any code under the `proxy/` directory
+- Use `make test-all` before completing work. This includes long running concurrency tests.
+
+### Commit message example format:
+
+```
+proxy: add new feature
+
+Add new feature that implements functionality X and Y.
+
+- key change 1
+- key change 2
+- key change 3
+
+fixes #123
+```
+
+## Code Reviews
+
+- use three levels High, Medium, Low severity
+- label each discovered issue with a label like H1, M2, L3 respectively
+- High severity are must fix issues (security, race conditions, critical bugs)
+- Medium severity are recommended improvements (coding style, missing functionality, inconsistencies)
+- Low severity are nice to have changes and nits
+- Include a suggestion with each discovered item
+- Limit your code review to three items with the highest priority first
+- Double check your discovered items and recommended remediations

CLAUDE.md

@@ -1,49 +1 @@
-## Project Description:
-
-llama-swap is a light weight, transparent proxy server that provides automatic model swapping to llama.cpp's server.
-
-## Tech stack
-
-- golang
-- typescript, vite and react for UI (located in ui/)
-
-## Workflow Tasks
-
-- when summarizing changes only include details that require further action
-- just say "Done." when there is no further action
-- use `gh` to create PRs and load issues
-- do include Co-Authored-By or created by when committing changes or creating PRs
-- keep PR descriptions short and focused on changes.
-  - never include a test plan
-
-## Testing
-
-- Follow test naming conventions like `TestProxyManager_<test name>`, `TestProcessGroup_<test name>`, etc.
-- Use `go test -v -run <name pattern for new tests>` to run any new tests you've written.
-- Use `make test-dev` after running new tests for a quick over all test run. This runs `go test` and `staticcheck`. Fix any static checking errors. Use this only when changes are made to any code under the `proxy/` directory
-- Use `make test-all` before completing work. This includes long running concurrency tests.
-
-### Commit message example format:
-
-```
-proxy: add new feature
-
-Add new feature that implements functionality X and Y.
-
-- key change 1
-- key change 2
-- key change 3
-
-fixes #123
-```
-
-## Code Reviews
-
-- use three levels High, Medium, Low severity
-- label each discovered issue with a label like H1, M2, L3 respectively
-- High severity are must fix issues (security, race conditions, critical bugs)
-- Medium severity are recommended improvements (coding style, missing functionality, inconsistencies)
-- Low severity are nice to have changes and nits
-- Include a suggestion with each discovered item
-- Limit your code review to three items with the highest priority first
-- Double check your discovered items and recommended remediations
+@AGENTS.md

README.md

@@ -13,7 +13,7 @@ Built in Go for performance and simplicity, llama-swap has zero dependencies and
 
 - ✅ Easy to deploy and configure: one binary, one configuration file. no external dependencies
 - ✅ On-demand model switching
-- ✅ Use any local OpenAI compatible server (llama.cpp, vllm, tabbyAPI, etc.)
+- ✅ Use any local OpenAI compatible server (llama.cpp, vllm, tabbyAPI, stable-diffusion.cpp, etc.)
   - future proof, upgrade your inference servers at any time.
 - ✅ OpenAI API supported endpoints:
   - `v1/completions`
@@ -69,6 +69,7 @@ llama-swap can be installed in multiple ways
 ### Docker Install ([download images](https://github.com/mostlygeek/llama-swap/pkgs/container/llama-swap))
 
 Nightly container images with llama-swap and llama-server are built for multiple platforms (cuda, vulkan, intel, etc.) including [non-root variants with improved security](docs/container-security.md).
+The stable-diffusion.cpp server is also included for the musa and vulkan platforms.
 
 ```shell
 $ docker pull ghcr.io/mostlygeek/llama-swap:cuda

cmd/simple-responder/simple-responder.go

@@ -210,6 +210,11 @@ func main() {
 		})
 	})
 
+	r.GET("/v1/audio/voices", func(c *gin.Context) {
+		model := c.Query("model")
+		c.JSON(http.StatusOK, gin.H{"voices": []string{"voice1"}, "model": model})
+	})
+
 	r.GET("/slow-respond", func(c *gin.Context) {
 		echo := c.Query("echo")
 		delay := c.Query("delay")

config-schema.json

@@ -87,6 +87,12 @@
             "default": 1000,
             "description": "Maximum number of metrics to keep in memory. Controls how many metrics are stored before older ones are discarded."
         },
+        "captureBuffer": {
+            "type": "integer",
+            "minimum": 0,
+            "default": 5,
+            "description": "Size in megabytes of the buffer for storing request/response captures. Set to 0 to disable captures."
+        },
         "startPort": {
             "type": "integer",
             "default": 5800,

config.example.yaml

@@ -50,6 +50,11 @@ logToStdout: "proxy"
 # - useful for limiting memory usage when processing large volumes of metrics
 metricsMaxInMemory: 1000
 
+# captureBuffer: how many MBs to allocate for storing request/response captures
+# - optional, default: 10
+# - set to 0 to disable
+captureBuffer: 15
+
 # startPort: sets the starting port number for the automatic ${PORT} macro.
 # - optional, default: 5800
 # - the ${PORT} macro can be used in model.cmd and model.proxy settings

docker/build-container.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euo pipefail
+
 cd $(dirname "$0")
 
 # use this to test locally, example:
@@ -8,6 +10,9 @@ cd $(dirname "$0")
 # the scopes: gist, read:org, repo, write:packages
 # then: gh auth login (and copy/paste the new token)
 
+LOG_DEBUG=${LOG_DEBUG:-0}
+DEBUG_ABORT_BUILD=${DEBUG_ABORT_BUILD:-}
+
 log_debug() {
     if [ "$LOG_DEBUG" = "1" ]; then
         echo "[DEBUG] $*"
@@ -31,7 +36,7 @@ if [[ ! " ${ALLOWED_ARCHS[@]} " =~ " ${ARCH} " ]]; then
 fi
 
 # Check if GITHUB_TOKEN is set and not empty
-if [[ -z "$GITHUB_TOKEN" ]]; then
+if [[ -z "${GITHUB_TOKEN:-}" ]]; then
   log_info "Error: GITHUB_TOKEN is not set or is empty."
   exit 1
 fi
@@ -39,6 +44,7 @@ fi
 # Set llama.cpp base image, customizable using the BASE_LLAMACPP_IMAGE environment
 # variable, this permits testing with forked llama.cpp repositories
 BASE_IMAGE=${BASE_LLAMACPP_IMAGE:-ghcr.io/ggml-org/llama.cpp}
+SD_IMAGE=${BASE_SDCPP_IMAGE:-ghcr.io/leejet/stable-diffusion.cpp}
 
 # Set llama-swap repository, automatically uses GITHUB_REPOSITORY variable
 # to enable easy container builds on forked repos
@@ -105,6 +111,8 @@ else
     BASE_TAG=server-${ARCH}-${LCPP_TAG}
 fi
 
+SD_TAG=master-${ARCH}
+
 # Abort if LCPP_TAG is empty.
 if [[ -z "$LCPP_TAG" ]]; then
     log_info "Abort: Could not find llama-server container for arch: $ARCH"
@@ -134,9 +142,21 @@ for CONTAINER_TYPE in non-root root; do
   fi
 
   log_info "Building $CONTAINER_TYPE $CONTAINER_TAG $LS_VER"
-  docker build -f llama-swap.Containerfile --build-arg BASE_TAG=${BASE_TAG} --build-arg LS_VER=${LS_VER} --build-arg UID=${USER_UID} \
+  docker build --provenance=false -f llama-swap.Containerfile --build-arg BASE_TAG=${BASE_TAG} --build-arg LS_VER=${LS_VER} --build-arg UID=${USER_UID} \
     --build-arg LS_REPO=${LS_REPO} --build-arg GID=${USER_GID} --build-arg USER_HOME=${USER_HOME} -t ${CONTAINER_TAG} -t ${CONTAINER_LATEST} \
     --build-arg BASE_IMAGE=${BASE_IMAGE} .
+
+  # For architectures with stable-diffusion.cpp support, layer sd-server on top
+  case "$ARCH" in
+    "musa" | "vulkan")
+      log_info "Adding sd-server to $CONTAINER_TAG"
+      docker build --provenance=false -f llama-swap-sd.Containerfile \
+        --build-arg BASE=${CONTAINER_TAG} \
+        --build-arg SD_IMAGE=${SD_IMAGE} --build-arg SD_TAG=${SD_TAG} \
+        --build-arg UID=${USER_UID} --build-arg GID=${USER_GID} \
+        -t ${CONTAINER_TAG} -t ${CONTAINER_LATEST} . ;;
+  esac
+
   if [ "$PUSH_IMAGES" == "true" ]; then
     docker push ${CONTAINER_TAG}
     docker push ${CONTAINER_LATEST}

docker/config.example.yaml

@@ -15,4 +15,19 @@ models:
     cmd: >
       /app/llama-server
       -hf bartowski/SmolLM2-135M-Instruct-GGUF:Q4_K_M
-      --port 9999
+      --port 9999
+
+  z-image:
+    checkEndpoint: /
+    cmd: |
+      /app/sd-server
+      --listen-port 9999
+      --diffusion-fa
+      --diffusion-model /models/z_image_turbo-Q8_0.gguf
+      --vae /models/ae.safetensors
+      --llm /models/qwen3-4b-instruct-2507-q8_0.gguf
+      --offload-to-cpu
+      --cfg-scale 1.0
+      --height 512 --width 512
+      --steps 8
+    aliases: [gpt-image-1,dall-e-2,dall-e-3,gpt-image-1-mini,gpt-image-1.5]

docker/llama-swap-sd.Containerfile

@@ -0,0 +1,11 @@
+ARG SD_IMAGE=ghcr.io/leejet/stable-diffusion.cpp
+ARG SD_TAG=master-vulkan
+ARG BASE=llama-swap:latest
+
+FROM ${SD_IMAGE}:${SD_TAG} AS sd-source
+FROM ${BASE}
+
+ARG UID=10001
+ARG GID=10001
+
+COPY --from=sd-source --chown=${UID}:${GID} /sd-server /app/sd-server

proxy/config/config.go

@@ -123,6 +123,7 @@ type Config struct {
 	LogTimeFormat      string                 `yaml:"logTimeFormat"`
 	LogToStdout        string                 `yaml:"logToStdout"`
 	MetricsMaxInMemory int                    `yaml:"metricsMaxInMemory"`
+	CaptureBuffer      int                    `yaml:"captureBuffer"`
 	Models             map[string]ModelConfig `yaml:"models"` /* key is model ID */
 	Profiles           map[string][]string    `yaml:"profiles"`
 	Groups             map[string]GroupConfig `yaml:"groups"` /* key is group ID */
@@ -201,6 +202,7 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 		LogTimeFormat:      "",
 		LogToStdout:        LogToStdoutProxy,
 		MetricsMaxInMemory: 1000,
+		CaptureBuffer:      5,
 	}
 	if err = yaml.Unmarshal([]byte(yamlStr), &config); err != nil {
 		return Config{}, err
@@ -667,11 +669,32 @@ func substituteMacroInValue(value any, macroName string, macroValue any) (any, e
 	}
 }
 
-// substituteEnvMacros replaces ${env.VAR_NAME} with environment variable values
-// Returns error if any env var is not set or contains invalid characters
+// substituteEnvMacros replaces ${env.VAR_NAME} with environment variable values.
+// Returns error if any referenced env var is not set or contains invalid characters.
+// Env macros inside YAML comments are ignored by unmarshalling the YAML first
+// (which strips comments) and only checking the comment-free version for macros.
 func substituteEnvMacros(s string) (string, error) {
-	result := s
-	matches := envMacroRegex.FindAllStringSubmatch(s, -1)
+	// Unmarshal and remarshal to strip YAML comments
+	var raw any
+	if err := yaml.Unmarshal([]byte(s), &raw); err != nil {
+		// If YAML is invalid, fall back to scanning the original string
+		// so the user gets the env var error rather than a confusing YAML parse error
+		return substituteEnvMacrosInString(s, s)
+	}
+	clean, err := yaml.Marshal(raw)
+	if err != nil {
+		return substituteEnvMacrosInString(s, s)
+	}
+
+	return substituteEnvMacrosInString(s, string(clean))
+}
+
+// substituteEnvMacrosInString finds ${env.VAR} macros in scanStr and substitutes
+// them in target. This separation allows scanning comment-free YAML while
+// substituting in the original string.
+func substituteEnvMacrosInString(target, scanStr string) (string, error) {
+	result := target
+	matches := envMacroRegex.FindAllStringSubmatch(scanStr, -1)
 	for _, match := range matches {
 		fullMatch := match[0] // ${env.VAR_NAME}
 		varName := match[1]   // VAR_NAME

proxy/config/config_posix_test.go

@@ -215,6 +215,7 @@ groups:
 		},
 		HealthCheckTimeout: 15,
 		MetricsMaxInMemory: 1000,
+		CaptureBuffer:      5,
 		Profiles: map[string][]string{
 			"test": {"model1", "model2"},
 		},

proxy/config/config_test.go

@@ -1308,4 +1308,68 @@ peers:
 		assert.Contains(t, err.Error(), "peers.openrouter.filters.setParams")
 		assert.Contains(t, err.Error(), "unknown macro")
 	})
+
+	t.Run("env macros in comments are ignored", func(t *testing.T) {
+		content := `
+# apiKeys:
+#   - "${env.COMMENTED_OUT_KEY_1}"
+#   - "${env.COMMENTED_OUT_KEY_2}"
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+`
+		// These env vars are NOT set, but should not cause an error
+		// because they only appear in comment lines
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Empty(t, config.RequiredAPIKeys)
+	})
+
+	t.Run("env macros in comments ignored while active ones resolve", func(t *testing.T) {
+		t.Setenv("TEST_ACTIVE_KEY", "active-key-value")
+
+		content := `
+# apiKeys: ["${env.COMMENTED_OUT_KEY}"]
+apiKeys: ["${env.TEST_ACTIVE_KEY}"]
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, []string{"active-key-value"}, config.RequiredAPIKeys)
+	})
+
+	t.Run("env macros in indented comments are ignored", func(t *testing.T) {
+		content := `
+models:
+  test:
+    cmd: |
+      server
+      --port 8080
+    proxy: "http://localhost:8080"
+    # metadata:
+    #   api_key: "${env.SOME_UNSET_KEY}"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+	})
+
+	t.Run("env macros in inline comments are ignored", func(t *testing.T) {
+		t.Setenv("TEST_INLINE_KEY", "real-value")
+
+		content := `
+apiKeys: ["${env.TEST_INLINE_KEY}"] # TODO: add ${env.FUTURE_KEY} later
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, []string{"real-value"}, config.RequiredAPIKeys)
+	})
+
 }

proxy/config/config_windows_test.go

@@ -204,6 +204,7 @@ groups:
 		},
 		HealthCheckTimeout: 15,
 		MetricsMaxInMemory: 1000,
+		CaptureBuffer:      5,
 		Profiles: map[string][]string{
 			"test": {"model1", "model2"},
 		},

proxy/events.go

@@ -8,6 +8,7 @@ const ConfigFileChangedEventID = 0x03
 const LogDataEventID = 0x04
 const TokenMetricsEventID = 0x05
 const ModelPreloadedEventID = 0x06
+const InFlightRequestsEventID = 0x07
 
 type ProcessStateChangeEvent struct {
 	ProcessName string
@@ -58,3 +59,11 @@ type ModelPreloadedEvent struct {
 func (e ModelPreloadedEvent) Type() uint32 {
 	return ModelPreloadedEventID
 }
+
+type InFlightRequestsEvent struct {
+	Total int
+}
+
+func (e InFlightRequestsEvent) Type() uint32 {
+	return InFlightRequestsEventID
+}

proxy/helpers_test.go

@@ -71,11 +71,15 @@ func getTestSimpleResponderConfig(expectedMessage string) config.ModelConfig {
 }
 
 func getTestSimpleResponderConfigPort(expectedMessage string, port int) config.ModelConfig {
+	// Convert path to forward slashes for cross-platform compatibility
+	// Windows handles forward slashes in paths correctly
+	cmdPath := filepath.ToSlash(simpleResponderPath)
+
 	// Create a YAML string with just the values we want to set
 	yamlStr := fmt.Sprintf(`
 cmd: '%s --port %d --silent --respond %s'
 proxy: "http://127.0.0.1:%d"
-`, simpleResponderPath, port, expectedMessage, port)
+`, cmdPath, port, expectedMessage, port)
 
 	var cfg config.ModelConfig
 	if err := yaml.Unmarshal([]byte(yamlStr), &cfg); err != nil {

proxy/metrics_monitor.go

@@ -28,6 +28,28 @@ type TokenMetrics struct {
 	PromptPerSecond float64   `json:"prompt_per_second"`
 	TokensPerSecond float64   `json:"tokens_per_second"`
 	DurationMs      int       `json:"duration_ms"`
+	HasCapture      bool      `json:"has_capture"`
+}
+
+type ReqRespCapture struct {
+	ID          int               `json:"id"`
+	ReqPath     string            `json:"req_path"`
+	ReqHeaders  map[string]string `json:"req_headers"`
+	ReqBody     []byte            `json:"req_body"`
+	RespHeaders map[string]string `json:"resp_headers"`
+	RespBody    []byte            `json:"resp_body"`
+}
+
+// Size returns the approximate memory usage of this capture in bytes
+func (c *ReqRespCapture) Size() int {
+	size := len(c.ReqPath) + len(c.ReqBody) + len(c.RespBody)
+	for k, v := range c.ReqHeaders {
+		size += len(k) + len(v)
+	}
+	for k, v := range c.RespHeaders {
+		size += len(k) + len(v)
+	}
+	return size
 }
 
 // TokenMetricsEvent represents a token metrics event
@@ -46,19 +68,32 @@ type metricsMonitor struct {
 	maxMetrics int
 	nextID     int
 	logger     *LogMonitor
+
+	// capture fields
+	enableCaptures bool
+	captures       map[int]ReqRespCapture // map for O(1) lookup by ID
+	captureOrder   []int                  // track insertion order for FIFO eviction
+	captureSize    int                    // current total size in bytes
+	maxCaptureSize int                    // max bytes for captures
 }
 
-func newMetricsMonitor(logger *LogMonitor, maxMetrics int) *metricsMonitor {
-	mp := &metricsMonitor{
-		logger:     logger,
-		maxMetrics: maxMetrics,
+// newMetricsMonitor creates a new metricsMonitor. captureBufferMB is the
+// capture buffer size in megabytes; 0 disables captures.
+func newMetricsMonitor(logger *LogMonitor, maxMetrics int, captureBufferMB int) *metricsMonitor {
+	return &metricsMonitor{
+		logger:         logger,
+		maxMetrics:     maxMetrics,
+		enableCaptures: captureBufferMB > 0,
+		captures:       make(map[int]ReqRespCapture),
+		captureOrder:   make([]int, 0),
+		captureSize:    0,
+		maxCaptureSize: captureBufferMB * 1024 * 1024,
 	}
-
-	return mp
 }
 
-// addMetrics adds a new metric to the collection and publishes an event
-func (mp *metricsMonitor) addMetrics(metric TokenMetrics) {
+// addMetrics adds a new metric to the collection and publishes an event.
+// Returns the assigned metric ID.
+func (mp *metricsMonitor) addMetrics(metric TokenMetrics) int {
 	mp.mu.Lock()
 	defer mp.mu.Unlock()
 
@@ -69,6 +104,49 @@ func (mp *metricsMonitor) addMetrics(metric TokenMetrics) {
 		mp.metrics = mp.metrics[len(mp.metrics)-mp.maxMetrics:]
 	}
 	event.Emit(TokenMetricsEvent{Metrics: metric})
+	return metric.ID
+}
+
+// addCapture adds a new capture to the buffer with size-based eviction.
+// Captures are skipped if enableCaptures is false or if capture exceeds maxCaptureSize.
+func (mp *metricsMonitor) addCapture(capture ReqRespCapture) {
+	if !mp.enableCaptures {
+		return
+	}
+
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	captureSize := capture.Size()
+	if captureSize > mp.maxCaptureSize {
+		mp.logger.Warnf("capture size %d exceeds max %d, skipping", captureSize, mp.maxCaptureSize)
+		return
+	}
+
+	// Evict oldest (FIFO) until room available
+	for mp.captureSize+captureSize > mp.maxCaptureSize && len(mp.captureOrder) > 0 {
+		oldestID := mp.captureOrder[0]
+		mp.captureOrder = mp.captureOrder[1:]
+		if evicted, exists := mp.captures[oldestID]; exists {
+			mp.captureSize -= evicted.Size()
+			delete(mp.captures, oldestID)
+		}
+	}
+
+	mp.captures[capture.ID] = capture
+	mp.captureOrder = append(mp.captureOrder, capture.ID)
+	mp.captureSize += captureSize
+}
+
+// getCaptureByID returns a capture by its ID, or nil if not found.
+func (mp *metricsMonitor) getCaptureByID(id int) *ReqRespCapture {
+	mp.mu.RLock()
+	defer mp.mu.RUnlock()
+
+	if capture, exists := mp.captures[id]; exists {
+		return &capture
+	}
+	return nil
 }
 
 // getMetrics returns a copy of the current metrics
@@ -97,6 +175,28 @@ func (mp *metricsMonitor) wrapHandler(
 	request *http.Request,
 	next func(modelID string, w http.ResponseWriter, r *http.Request) error,
 ) error {
+	// Capture request body and headers if captures enabled
+	var reqBody []byte
+	var reqHeaders map[string]string
+	if mp.enableCaptures {
+		if request.Body != nil {
+			var err error
+			reqBody, err = io.ReadAll(request.Body)
+			if err != nil {
+				return fmt.Errorf("failed to read request body for capture: %w", err)
+			}
+			request.Body.Close()
+			request.Body = io.NopCloser(bytes.NewBuffer(reqBody))
+		}
+		reqHeaders = make(map[string]string)
+		for key, values := range request.Header {
+			if len(values) > 0 {
+				reqHeaders[key] = values[0]
+			}
+		}
+		redactHeaders(reqHeaders)
+	}
+
 	recorder := newBodyCopier(writer)
 
 	// Filter Accept-Encoding to only include encodings we can decompress for metrics
@@ -140,7 +240,6 @@ func (mp *metricsMonitor) wrapHandler(
 			return nil
 		}
 	}
-
 	if strings.Contains(recorder.Header().Get("Content-Type"), "text/event-stream") {
 		if parsed, err := processStreamingResponse(modelID, recorder.StartTime(), body); err != nil {
 			mp.logger.Warnf("error processing streaming response: %v, path=%s, recording minimal metrics", err, request.URL.Path)
@@ -153,6 +252,14 @@ func (mp *metricsMonitor) wrapHandler(
 			usage := parsed.Get("usage")
 			timings := parsed.Get("timings")
 
+			// extract timings for infill - response is an array, timings are in the last element
+			// see #463
+			if strings.HasPrefix(request.URL.Path, "/infill") {
+				if arr := parsed.Array(); len(arr) > 0 {
+					timings = arr[len(arr)-1].Get("timings")
+				}
+			}
+
 			if usage.Exists() || timings.Exists() {
 				if parsedMetrics, err := parseMetrics(modelID, recorder.StartTime(), usage, timings); err != nil {
 					mp.logger.Warnf("error parsing metrics: %v, path=%s, recording minimal metrics", err, request.URL.Path)
@@ -165,7 +272,38 @@ func (mp *metricsMonitor) wrapHandler(
 		}
 	}
 
-	mp.addMetrics(tm)
+	// Build capture if enabled and determine if it will be stored
+	var capture *ReqRespCapture
+	if mp.enableCaptures {
+		respHeaders := make(map[string]string)
+		for key, values := range recorder.Header() {
+			if len(values) > 0 {
+				respHeaders[key] = values[0]
+			}
+		}
+		redactHeaders(respHeaders)
+		delete(respHeaders, "Content-Encoding")
+		capture = &ReqRespCapture{
+			ReqPath:     request.URL.Path,
+			ReqHeaders:  reqHeaders,
+			ReqBody:     reqBody,
+			RespHeaders: respHeaders,
+			RespBody:    body,
+		}
+		// Only set HasCapture if the capture will actually be stored (not too large)
+		if capture.Size() <= mp.maxCaptureSize {
+			tm.HasCapture = true
+		}
+	}
+
+	metricID := mp.addMetrics(tm)
+
+	// Store capture if enabled
+	if capture != nil {
+		capture.ID = metricID
+		mp.addCapture(*capture)
+	}
+
 	return nil
 }
 
@@ -336,6 +474,24 @@ func (w *responseBodyCopier) StartTime() time.Time {
 	return w.start
 }
 
+// sensitiveHeaders lists headers that should be redacted in captures
+var sensitiveHeaders = map[string]bool{
+	"authorization":       true,
+	"proxy-authorization": true,
+	"cookie":              true,
+	"set-cookie":          true,
+	"x-api-key":           true,
+}
+
+// redactHeaders replaces sensitive header values in-place with "[REDACTED]"
+func redactHeaders(headers map[string]string) {
+	for key := range headers {
+		if sensitiveHeaders[strings.ToLower(key)] {
+			headers[key] = "[REDACTED]"
+		}
+	}
+}
+
 // filterAcceptEncoding filters the Accept-Encoding header to only include
 // encodings we can decompress (gzip, deflate). This respects the client's
 // preferences while ensuring we can parse response bodies for metrics.

proxy/metrics_monitor_test.go

@@ -18,7 +18,7 @@ import (
 
 func TestMetricsMonitor_AddMetrics(t *testing.T) {
 	t.Run("adds metrics and assigns ID", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		metric := TokenMetrics{
 			Model:        "test-model",
@@ -37,7 +37,7 @@ func TestMetricsMonitor_AddMetrics(t *testing.T) {
 	})
 
 	t.Run("increments ID for each metric", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		for i := 0; i < 5; i++ {
 			mm.addMetrics(TokenMetrics{Model: "model"})
@@ -51,7 +51,7 @@ func TestMetricsMonitor_AddMetrics(t *testing.T) {
 	})
 
 	t.Run("respects max metrics limit", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 3)
+		mm := newMetricsMonitor(testLogger, 3, 0)
 
 		// Add 5 metrics
 		for i := 0; i < 5; i++ {
@@ -71,7 +71,7 @@ func TestMetricsMonitor_AddMetrics(t *testing.T) {
 	})
 
 	t.Run("emits TokenMetricsEvent", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		receivedEvent := make(chan TokenMetricsEvent, 1)
 		cancel := event.On(func(e TokenMetricsEvent) {
@@ -101,14 +101,14 @@ func TestMetricsMonitor_AddMetrics(t *testing.T) {
 
 func TestMetricsMonitor_GetMetrics(t *testing.T) {
 	t.Run("returns empty slice when no metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 		metrics := mm.getMetrics()
 		assert.NotNil(t, metrics)
 		assert.Equal(t, 0, len(metrics))
 	})
 
 	t.Run("returns copy of metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 		mm.addMetrics(TokenMetrics{Model: "model1"})
 		mm.addMetrics(TokenMetrics{Model: "model2"})
 
@@ -128,7 +128,7 @@ func TestMetricsMonitor_GetMetrics(t *testing.T) {
 
 func TestMetricsMonitor_GetMetricsJSON(t *testing.T) {
 	t.Run("returns valid JSON for empty metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 		jsonData, err := mm.getMetricsJSON()
 		assert.NoError(t, err)
 		assert.NotNil(t, jsonData)
@@ -140,7 +140,7 @@ func TestMetricsMonitor_GetMetricsJSON(t *testing.T) {
 	})
 
 	t.Run("returns valid JSON with metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 		mm.addMetrics(TokenMetrics{
 			Model:           "model1",
 			InputTokens:     100,
@@ -168,7 +168,7 @@ func TestMetricsMonitor_GetMetricsJSON(t *testing.T) {
 
 func TestMetricsMonitor_WrapHandler(t *testing.T) {
 	t.Run("successful non-streaming request with usage data", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{
 			"usage": {
@@ -199,7 +199,7 @@ func TestMetricsMonitor_WrapHandler(t *testing.T) {
 	})
 
 	t.Run("successful request with timings data", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{
 			"timings": {
@@ -239,7 +239,7 @@ func TestMetricsMonitor_WrapHandler(t *testing.T) {
 	})
 
 	t.Run("streaming request with SSE format", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		// Note: SSE format requires proper line breaks - each data line followed by blank line
 		responseBody := `data: {"choices":[{"text":"Hello"}]}
@@ -275,7 +275,7 @@ data: [DONE]
 	})
 
 	t.Run("non-OK status code does not record metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
 			w.WriteHeader(http.StatusBadRequest)
@@ -295,7 +295,7 @@ data: [DONE]
 	})
 
 	t.Run("empty response body records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
 			w.WriteHeader(http.StatusOK)
@@ -317,7 +317,7 @@ data: [DONE]
 	})
 
 	t.Run("invalid JSON records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
 			w.Header().Set("Content-Type", "application/json")
@@ -341,7 +341,7 @@ data: [DONE]
 	})
 
 	t.Run("next handler error is propagated", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		expectedErr := assert.AnError
 		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
@@ -360,7 +360,7 @@ data: [DONE]
 	})
 
 	t.Run("response without usage or timings records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{"result": "ok"}`
 
@@ -384,6 +384,75 @@ data: [DONE]
 		assert.Equal(t, 0, metrics[0].InputTokens)
 		assert.Equal(t, 0, metrics[0].OutputTokens)
 	})
+
+	t.Run("infill request extracts timings from last array element", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 0)
+
+		// Infill response is an array with timings in the last element
+		responseBody := `[
+			{"content": "first chunk"},
+			{"content": "second chunk"},
+			{"content": "final", "timings": {
+				"prompt_n": 150,
+				"predicted_n": 75,
+				"prompt_per_second": 200.5,
+				"predicted_per_second": 35.5,
+				"prompt_ms": 600.0,
+				"predicted_ms": 1800.0,
+				"cache_n": 30
+			}}
+		]`
+
+		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(responseBody))
+			return nil
+		}
+
+		req := httptest.NewRequest("POST", "/infill", nil)
+		rec := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(rec)
+
+		err := mm.wrapHandler("test-model", ginCtx.Writer, req, nextHandler)
+		assert.NoError(t, err)
+
+		metrics := mm.getMetrics()
+		assert.Equal(t, 1, len(metrics))
+		assert.Equal(t, "test-model", metrics[0].Model)
+		assert.Equal(t, 150, metrics[0].InputTokens)
+		assert.Equal(t, 75, metrics[0].OutputTokens)
+		assert.Equal(t, 30, metrics[0].CachedTokens)
+		assert.Equal(t, 200.5, metrics[0].PromptPerSecond)
+		assert.Equal(t, 35.5, metrics[0].TokensPerSecond)
+		assert.Equal(t, 2400, metrics[0].DurationMs) // 600 + 1800
+	})
+
+	t.Run("infill request with empty array records minimal metrics", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 0)
+
+		responseBody := `[]`
+
+		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(responseBody))
+			return nil
+		}
+
+		req := httptest.NewRequest("POST", "/infill", nil)
+		rec := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(rec)
+
+		err := mm.wrapHandler("test-model", ginCtx.Writer, req, nextHandler)
+		assert.NoError(t, err)
+
+		metrics := mm.getMetrics()
+		assert.Equal(t, 1, len(metrics))
+		assert.Equal(t, "test-model", metrics[0].Model)
+		assert.Equal(t, 0, metrics[0].InputTokens)
+		assert.Equal(t, 0, metrics[0].OutputTokens)
+	})
 }
 
 func TestMetricsMonitor_ResponseBodyCopier(t *testing.T) {
@@ -437,7 +506,7 @@ func TestMetricsMonitor_ResponseBodyCopier(t *testing.T) {
 
 func TestMetricsMonitor_Concurrent(t *testing.T) {
 	t.Run("concurrent addMetrics is safe", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 1000)
+		mm := newMetricsMonitor(testLogger, 1000, 0)
 
 		var wg sync.WaitGroup
 		numGoroutines := 10
@@ -464,7 +533,7 @@ func TestMetricsMonitor_Concurrent(t *testing.T) {
 	})
 
 	t.Run("concurrent reads and writes are safe", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 100)
+		mm := newMetricsMonitor(testLogger, 100, 0)
 
 		done := make(chan bool)
 
@@ -502,7 +571,7 @@ func TestMetricsMonitor_Concurrent(t *testing.T) {
 
 func TestMetricsMonitor_ParseMetrics(t *testing.T) {
 	t.Run("prefers timings over usage data", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		// Timings should take precedence over usage
 		responseBody := `{
@@ -542,7 +611,7 @@ func TestMetricsMonitor_ParseMetrics(t *testing.T) {
 	})
 
 	t.Run("handles missing cache_n in timings", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{
 			"timings": {
@@ -577,7 +646,7 @@ func TestMetricsMonitor_ParseMetrics(t *testing.T) {
 
 func TestMetricsMonitor_StreamingResponse(t *testing.T) {
 	t.Run("finds metrics in last valid SSE data", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		// Metrics should be found in the last data line before [DONE]
 		responseBody := `data: {"choices":[{"text":"First"}]}
@@ -611,7 +680,7 @@ data: [DONE]
 	})
 
 	t.Run("handles streaming with no valid JSON records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `data: not json
 
@@ -641,7 +710,7 @@ data: [DONE]
 	})
 
 	t.Run("handles empty streaming response records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := ``
 
@@ -669,7 +738,7 @@ data: [DONE]
 
 // Benchmark tests
 func BenchmarkMetricsMonitor_AddMetrics(b *testing.B) {
-	mm := newMetricsMonitor(testLogger, 1000)
+	mm := newMetricsMonitor(testLogger, 1000, 0)
 
 	metric := TokenMetrics{
 		Model:           "test-model",
@@ -690,7 +759,7 @@ func BenchmarkMetricsMonitor_AddMetrics(b *testing.B) {
 
 func BenchmarkMetricsMonitor_AddMetrics_SmallBuffer(b *testing.B) {
 	// Test performance with a smaller buffer where wrapping occurs more frequently
-	mm := newMetricsMonitor(testLogger, 100)
+	mm := newMetricsMonitor(testLogger, 100, 0)
 
 	metric := TokenMetrics{
 		Model:           "test-model",
@@ -711,7 +780,7 @@ func BenchmarkMetricsMonitor_AddMetrics_SmallBuffer(b *testing.B) {
 
 func TestMetricsMonitor_WrapHandler_Compression(t *testing.T) {
 	t.Run("gzip encoded response", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{"usage": {"prompt_tokens": 100, "completion_tokens": 50}}`
 
@@ -745,7 +814,7 @@ func TestMetricsMonitor_WrapHandler_Compression(t *testing.T) {
 	})
 
 	t.Run("deflate encoded response", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{"usage": {"prompt_tokens": 200, "completion_tokens": 75}}`
 
@@ -779,7 +848,7 @@ func TestMetricsMonitor_WrapHandler_Compression(t *testing.T) {
 	})
 
 	t.Run("invalid gzip data records minimal metrics", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		// Invalid compressed data
 		invalidData := []byte("this is not gzip data")
@@ -807,7 +876,7 @@ func TestMetricsMonitor_WrapHandler_Compression(t *testing.T) {
 	})
 
 	t.Run("unknown encoding treated as uncompressed", func(t *testing.T) {
-		mm := newMetricsMonitor(testLogger, 10)
+		mm := newMetricsMonitor(testLogger, 10, 0)
 
 		responseBody := `{"usage": {"prompt_tokens": 300, "completion_tokens": 100}}`
 
@@ -832,3 +901,228 @@ func TestMetricsMonitor_WrapHandler_Compression(t *testing.T) {
 		assert.Equal(t, 100, metrics[0].OutputTokens)
 	})
 }
+
+func TestReqRespCapture_Size(t *testing.T) {
+	t.Run("calculates size correctly", func(t *testing.T) {
+		capture := ReqRespCapture{
+			ID:      1,
+			ReqPath: "/v1/chat/completions", // 20 bytes
+			ReqHeaders: map[string]string{
+				"Content-Type": "application/json", // 12 + 16 = 28
+			},
+			ReqBody: []byte("request body"), // 12 bytes
+			RespHeaders: map[string]string{
+				"X-Test": "value", // 6 + 5 = 11
+			},
+			RespBody: []byte("response body"), // 13 bytes
+		}
+
+		// Expected: 20 + 12 + 13 + 28 + 11 = 84
+		assert.Equal(t, 84, capture.Size())
+	})
+
+	t.Run("handles empty capture", func(t *testing.T) {
+		capture := ReqRespCapture{}
+		assert.Equal(t, 0, capture.Size())
+	})
+}
+
+func TestMetricsMonitor_AddCapture(t *testing.T) {
+	t.Run("does nothing when captures disabled", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 0)
+
+		capture := ReqRespCapture{
+			ID:      0,
+			ReqBody: []byte("test"),
+		}
+		mm.addCapture(capture)
+
+		// Should not store capture
+		assert.Nil(t, mm.getCaptureByID(0))
+	})
+
+	t.Run("adds capture when enabled", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+
+		capture := ReqRespCapture{
+			ID:       0,
+			ReqBody:  []byte("test request"),
+			RespBody: []byte("test response"),
+		}
+		mm.addCapture(capture)
+
+		retrieved := mm.getCaptureByID(0)
+		assert.NotNil(t, retrieved)
+		assert.Equal(t, 0, retrieved.ID)
+		assert.Equal(t, []byte("test request"), retrieved.ReqBody)
+		assert.Equal(t, []byte("test response"), retrieved.RespBody)
+	})
+
+	t.Run("evicts oldest when exceeding max size", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+		mm.maxCaptureSize = 100 // Set small limit for test
+
+		// Add captures that will exceed the limit
+		capture1 := ReqRespCapture{ID: 0, ReqBody: make([]byte, 40)}
+		capture2 := ReqRespCapture{ID: 1, ReqBody: make([]byte, 40)}
+		capture3 := ReqRespCapture{ID: 2, ReqBody: make([]byte, 40)}
+
+		mm.addCapture(capture1)
+		mm.addCapture(capture2)
+		// Adding capture3 should evict capture1
+		mm.addCapture(capture3)
+
+		assert.Nil(t, mm.getCaptureByID(0), "capture 0 should be evicted")
+		assert.NotNil(t, mm.getCaptureByID(1), "capture 1 should exist")
+		assert.NotNil(t, mm.getCaptureByID(2), "capture 2 should exist")
+	})
+
+	t.Run("skips capture larger than max size", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+		mm.maxCaptureSize = 100
+
+		// Add a capture larger than max
+		largeCapture := ReqRespCapture{ID: 0, ReqBody: make([]byte, 200)}
+		mm.addCapture(largeCapture)
+
+		assert.Nil(t, mm.getCaptureByID(0), "oversized capture should not be stored")
+	})
+}
+
+func TestMetricsMonitor_GetCaptureByID(t *testing.T) {
+	t.Run("returns nil for non-existent ID", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+
+		assert.Nil(t, mm.getCaptureByID(999))
+	})
+
+	t.Run("returns capture by ID", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+
+		capture := ReqRespCapture{
+			ID:      42,
+			ReqBody: []byte("test"),
+		}
+		mm.addCapture(capture)
+
+		retrieved := mm.getCaptureByID(42)
+		assert.NotNil(t, retrieved)
+		assert.Equal(t, 42, retrieved.ID)
+	})
+}
+
+func TestRedactHeaders(t *testing.T) {
+	t.Run("redacts sensitive headers", func(t *testing.T) {
+		headers := map[string]string{
+			"Authorization":       "Bearer secret-token",
+			"Proxy-Authorization": "Basic creds",
+			"Cookie":              "session=abc123",
+			"Set-Cookie":          "session=xyz789",
+			"X-Api-Key":           "sk-12345",
+			"Content-Type":        "application/json",
+			"X-Custom":            "safe-value",
+		}
+
+		redactHeaders(headers)
+
+		assert.Equal(t, "[REDACTED]", headers["Authorization"])
+		assert.Equal(t, "[REDACTED]", headers["Proxy-Authorization"])
+		assert.Equal(t, "[REDACTED]", headers["Cookie"])
+		assert.Equal(t, "[REDACTED]", headers["Set-Cookie"])
+		assert.Equal(t, "[REDACTED]", headers["X-Api-Key"])
+		assert.Equal(t, "application/json", headers["Content-Type"])
+		assert.Equal(t, "safe-value", headers["X-Custom"])
+	})
+
+	t.Run("handles mixed case header names", func(t *testing.T) {
+		headers := map[string]string{
+			"authorization": "Bearer token",
+			"COOKIE":        "session=abc",
+			"x-api-key":     "key123",
+		}
+
+		redactHeaders(headers)
+
+		assert.Equal(t, "[REDACTED]", headers["authorization"])
+		assert.Equal(t, "[REDACTED]", headers["COOKIE"])
+		assert.Equal(t, "[REDACTED]", headers["x-api-key"])
+	})
+
+	t.Run("handles empty headers", func(t *testing.T) {
+		headers := map[string]string{}
+		redactHeaders(headers)
+		assert.Empty(t, headers)
+	})
+}
+
+func TestMetricsMonitor_WrapHandler_Capture(t *testing.T) {
+	t.Run("captures request and response when enabled", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 5)
+
+		requestBody := `{"model": "test", "prompt": "hello"}`
+		responseBody := `{"usage": {"prompt_tokens": 100, "completion_tokens": 50}}`
+
+		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
+			w.Header().Set("Content-Type", "application/json")
+			w.Header().Set("X-Custom", "header-value")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(responseBody))
+			return nil
+		}
+
+		req := httptest.NewRequest("POST", "/test", bytes.NewBufferString(requestBody))
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("Authorization", "Bearer secret")
+		rec := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(rec)
+
+		err := mm.wrapHandler("test-model", ginCtx.Writer, req, nextHandler)
+		assert.NoError(t, err)
+
+		// Check metric was recorded
+		metrics := mm.getMetrics()
+		assert.Equal(t, 1, len(metrics))
+		metricID := metrics[0].ID
+
+		// Check capture was stored with same ID
+		capture := mm.getCaptureByID(metricID)
+		assert.NotNil(t, capture)
+		assert.Equal(t, metricID, capture.ID)
+		assert.Equal(t, []byte(requestBody), capture.ReqBody)
+		assert.Equal(t, []byte(responseBody), capture.RespBody)
+		assert.Equal(t, "/test", capture.ReqPath)
+		assert.Equal(t, "application/json", capture.ReqHeaders["Content-Type"])
+		assert.Equal(t, "[REDACTED]", capture.ReqHeaders["Authorization"])
+		assert.Equal(t, "application/json", capture.RespHeaders["Content-Type"])
+		assert.Equal(t, "header-value", capture.RespHeaders["X-Custom"])
+	})
+
+	t.Run("does not capture when disabled", func(t *testing.T) {
+		mm := newMetricsMonitor(testLogger, 10, 0)
+
+		requestBody := `{"model": "test"}`
+		responseBody := `{"usage": {"prompt_tokens": 100, "completion_tokens": 50}}`
+
+		nextHandler := func(modelID string, w http.ResponseWriter, r *http.Request) error {
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(responseBody))
+			return nil
+		}
+
+		req := httptest.NewRequest("POST", "/test", bytes.NewBufferString(requestBody))
+		rec := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(rec)
+
+		err := mm.wrapHandler("test-model", ginCtx.Writer, req, nextHandler)
+		assert.NoError(t, err)
+
+		// Metrics should still be recorded
+		metrics := mm.getMetrics()
+		assert.Equal(t, 1, len(metrics))
+
+		// But no capture
+		capture := mm.getCaptureByID(metrics[0].ID)
+		assert.Nil(t, capture)
+	})
+}

proxy/proxymanager.go

@@ -28,6 +28,40 @@ const (
 
 type proxyCtxKey string
 
+type InflightCounter struct {
+	mu    sync.Mutex
+	total int
+}
+
+func newInflightCounter() *InflightCounter {
+	return &InflightCounter{}
+}
+
+func (ic *InflightCounter) Current() int {
+	ic.mu.Lock()
+	total := ic.total
+	ic.mu.Unlock()
+	return total
+}
+
+func (ic *InflightCounter) Increment() int {
+	ic.mu.Lock()
+	ic.total++
+	total := ic.total
+	ic.mu.Unlock()
+	return total
+}
+
+func (ic *InflightCounter) Decrement() int {
+	ic.mu.Lock()
+	if ic.total > 0 {
+		ic.total--
+	}
+	total := ic.total
+	ic.mu.Unlock()
+	return total
+}
+
 type ProxyManager struct {
 	sync.Mutex
 
@@ -43,6 +77,8 @@ type ProxyManager struct {
 
 	processGroups map[string]*ProcessGroup
 
+	inFlightCounter *InflightCounter
+
 	// shutdown signaling
 	shutdownCtx    context.Context
 	shutdownCancel context.CancelFunc
@@ -151,10 +187,12 @@ func New(proxyConfig config.Config) *ProxyManager {
 		muxLogger:      muxLogger,
 		upstreamLogger: upstreamLogger,
 
-		metricsMonitor: newMetricsMonitor(proxyLogger, maxMetrics),
+		metricsMonitor: newMetricsMonitor(proxyLogger, maxMetrics, proxyConfig.CaptureBuffer),
 
 		processGroups: make(map[string]*ProcessGroup),
 
+		inFlightCounter: newInflightCounter(),
+
 		shutdownCtx:    shutdownCtx,
 		shutdownCancel: shutdownCancel,
 
@@ -276,36 +314,37 @@ func (pm *ProxyManager) setupGinEngine() {
 
 	// Set up routes using the Gin engine
 	// Protected routes use pm.apiKeyAuth() middleware
-	pm.ginEngine.POST("/v1/chat/completions", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/responses", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/chat/completions", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/responses", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 	// Support legacy /v1/completions api, see issue #12
-	pm.ginEngine.POST("/v1/completions", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/completions", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 	// Support anthropic /v1/messages (added https://github.com/ggml-org/llama.cpp/pull/17570)
-	pm.ginEngine.POST("/v1/messages", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/messages", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 	// Support anthropic count_tokens API (Also added in the above PR)
-	pm.ginEngine.POST("/v1/messages/count_tokens", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/messages/count_tokens", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 
 	// Support embeddings and reranking
-	pm.ginEngine.POST("/v1/embeddings", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/embeddings", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 
 	// llama-server's /reranking endpoint + aliases
-	pm.ginEngine.POST("/reranking", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/rerank", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/rerank", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/reranking", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/reranking", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/rerank", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/rerank", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/reranking", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 
 	// llama-server's /infill endpoint for code infilling
-	pm.ginEngine.POST("/infill", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/infill", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 
 	// llama-server's /completion endpoint
-	pm.ginEngine.POST("/completion", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/completion", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
 
 	// Support audio/speech endpoint
-	pm.ginEngine.POST("/v1/audio/speech", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/audio/voices", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/audio/transcriptions", pm.apiKeyAuth(), pm.proxyOAIPostFormHandler)
-	pm.ginEngine.POST("/v1/images/generations", pm.apiKeyAuth(), pm.proxyInferenceHandler)
-	pm.ginEngine.POST("/v1/images/edits", pm.apiKeyAuth(), pm.proxyOAIPostFormHandler)
+	pm.ginEngine.POST("/v1/audio/speech", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/audio/voices", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.GET("/v1/audio/voices", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyGETModelHandler)
+	pm.ginEngine.POST("/v1/audio/transcriptions", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyOAIPostFormHandler)
+	pm.ginEngine.POST("/v1/images/generations", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyInferenceHandler)
+	pm.ginEngine.POST("/v1/images/edits", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyOAIPostFormHandler)
 
 	pm.ginEngine.GET("/v1/models", pm.apiKeyAuth(), pm.listModelsHandler)
 
@@ -324,7 +363,7 @@ func (pm *ProxyManager) setupGinEngine() {
 	pm.ginEngine.GET("/upstream", func(c *gin.Context) {
 		c.Redirect(http.StatusFound, "/ui/models")
 	})
-	pm.ginEngine.Any("/upstream/*upstreamPath", pm.apiKeyAuth(), pm.proxyToUpstream)
+	pm.ginEngine.Any("/upstream/*upstreamPath", pm.apiKeyAuth(), pm.trackInflight(), pm.proxyToUpstream)
 	pm.ginEngine.GET("/unload", pm.apiKeyAuth(), pm.unloadAllModelsHandler)
 	pm.ginEngine.GET("/running", pm.apiKeyAuth(), pm.listRunningProcessesHandler)
 	pm.ginEngine.GET("/health", func(c *gin.Context) {
@@ -348,25 +387,35 @@ func (pm *ProxyManager) setupGinEngine() {
 	if err != nil {
 		pm.proxyLogger.Errorf("Failed to load React filesystem: %v", err)
 	} else {
+		// Serve files with compression support under /ui/*
+		// This handler checks for pre-compressed .br and .gz files
+		pm.ginEngine.GET("/ui/*filepath", func(c *gin.Context) {
+			filepath := strings.TrimPrefix(c.Param("filepath"), "/")
+			// Default to index.html for directory-like paths
+			if filepath == "" {
+				filepath = "index.html"
+			}
 
-		// serve files that exist under /ui/*
-		pm.ginEngine.StaticFS("/ui", reactFS)
+			ServeCompressedFile(reactFS, c.Writer, c.Request, filepath)
+		})
 
-		// server SPA for UI under /ui/*
+		// Serve SPA for UI under /ui/* - fallback to index.html for client-side routing
 		pm.ginEngine.NoRoute(func(c *gin.Context) {
 			if !strings.HasPrefix(c.Request.URL.Path, "/ui") {
 				c.AbortWithStatus(http.StatusNotFound)
 				return
 			}
 
-			file, err := reactFS.Open("index.html")
-			if err != nil {
-				c.String(http.StatusInternalServerError, err.Error())
+			// Check if this looks like a file request (has extension)
+			path := c.Request.URL.Path
+			if strings.Contains(path, ".") && !strings.HasSuffix(path, "/") {
+				// This was likely a file request that wasn't found
+				c.AbortWithStatus(http.StatusNotFound)
 				return
 			}
-			defer file.Close()
-			http.ServeContent(c.Writer, c.Request, "index.html", time.Now(), file)
 
+			// Serve index.html for SPA routing
+			ServeCompressedFile(reactFS, c.Writer, c.Request, "index.html")
 		})
 	}
 
@@ -378,6 +427,14 @@ func (pm *ProxyManager) setupGinEngine() {
 	gin.DisableConsoleColor()
 }
 
+func (pm *ProxyManager) trackInflight() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		event.Emit(InFlightRequestsEvent{Total: pm.inFlightCounter.Increment()})
+		defer event.Emit(InFlightRequestsEvent{Total: pm.inFlightCounter.Decrement()})
+		c.Next()
+	}
+}
+
 // ServeHTTP implements http.Handler interface
 func (pm *ProxyManager) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	pm.ginEngine.ServeHTTP(w, r)
@@ -744,15 +801,29 @@ func (pm *ProxyManager) proxyOAIPostFormHandler(c *gin.Context) {
 		return
 	}
 
+	// Look for a matching local model first, then check peers
+	var nextHandler func(modelID string, w http.ResponseWriter, r *http.Request) error
+	var useModelName string
+
 	modelID, found := pm.config.RealModelName(requestedModel)
-	if !found {
-		pm.sendErrorResponse(c, http.StatusBadRequest, fmt.Sprintf("could not find real modelID for %s", requestedModel))
-		return
+	if found {
+		processGroup, err := pm.swapProcessGroup(modelID)
+		if err != nil {
+			pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error swapping process group: %s", err.Error()))
+			return
+		}
+
+		useModelName = pm.config.Models[modelID].UseModelName
+		pm.proxyLogger.Debugf("ProxyManager using local Process for model: %s", requestedModel)
+		nextHandler = processGroup.ProxyRequest
+	} else if pm.peerProxy != nil && pm.peerProxy.HasPeerModel(requestedModel) {
+		pm.proxyLogger.Debugf("ProxyManager using ProxyPeer for model: %s", requestedModel)
+		modelID = requestedModel
+		nextHandler = pm.peerProxy.ProxyRequest
 	}
 
-	processGroup, err := pm.swapProcessGroup(modelID)
-	if err != nil {
-		pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error swapping process group: %s", err.Error()))
+	if nextHandler == nil {
+		pm.sendErrorResponse(c, http.StatusBadRequest, fmt.Sprintf("could not find suitable handler for %s", requestedModel))
 		return
 	}
 
@@ -768,8 +839,6 @@ func (pm *ProxyManager) proxyOAIPostFormHandler(c *gin.Context) {
 			// If this is the model field and we have a profile, use just the model name
 			if key == "model" {
 				// # issue #69 allow custom model names to be sent to upstream
-				useModelName := pm.config.Models[modelID].UseModelName
-
 				if useModelName != "" {
 					fieldValue = useModelName
 				} else {
@@ -839,9 +908,46 @@ func (pm *ProxyManager) proxyOAIPostFormHandler(c *gin.Context) {
 	modifiedReq.ContentLength = int64(requestBuffer.Len())
 
 	// Use the modified request for proxying
-	if err := processGroup.ProxyRequest(modelID, c.Writer, modifiedReq); err != nil {
+	if err := nextHandler(modelID, c.Writer, modifiedReq); err != nil {
 		pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error proxying request: %s", err.Error()))
-		pm.proxyLogger.Errorf("Error Proxying Request for processGroup %s and model %s", processGroup.id, modelID)
+		pm.proxyLogger.Errorf("Error Proxying Request for model %s", modelID)
+		return
+	}
+}
+
+func (pm *ProxyManager) proxyGETModelHandler(c *gin.Context) {
+	requestedModel := c.Query("model")
+	if requestedModel == "" {
+		pm.sendErrorResponse(c, http.StatusBadRequest, "missing required 'model' query parameter")
+		return
+	}
+
+	var nextHandler func(modelID string, w http.ResponseWriter, r *http.Request) error
+	var modelID string
+
+	if realModelID, found := pm.config.RealModelName(requestedModel); found {
+		processGroup, err := pm.swapProcessGroup(realModelID)
+		if err != nil {
+			pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error swapping process group: %s", err.Error()))
+			return
+		}
+		modelID = realModelID
+		pm.proxyLogger.Debugf("ProxyManager using local Process for model: %s", requestedModel)
+		nextHandler = processGroup.ProxyRequest
+	} else if pm.peerProxy != nil && pm.peerProxy.HasPeerModel(requestedModel) {
+		modelID = requestedModel
+		pm.proxyLogger.Debugf("ProxyManager using ProxyPeer for model: %s", requestedModel)
+		nextHandler = pm.peerProxy.ProxyRequest
+	}
+
+	if nextHandler == nil {
+		pm.sendErrorResponse(c, http.StatusBadRequest, fmt.Sprintf("could not find suitable handler for %s", requestedModel))
+		return
+	}
+
+	if err := nextHandler(modelID, c.Writer, c.Request); err != nil {
+		pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error proxying request: %s", err.Error()))
+		pm.proxyLogger.Errorf("Error Proxying GET Request for model %s", modelID)
 		return
 	}
 }

proxy/proxymanager_api.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"sort"
+	"strconv"
 	"strings"
 
 	"github.com/gin-gonic/gin"
@@ -31,6 +32,7 @@ func addApiHandlers(pm *ProxyManager) {
 		apiGroup.GET("/events", pm.apiSendEvents)
 		apiGroup.GET("/metrics", pm.apiGetMetrics)
 		apiGroup.GET("/version", pm.apiGetVersion)
+		apiGroup.GET("/captures/:id", pm.apiGetCapture)
 	}
 }
 
@@ -105,6 +107,7 @@ const (
 	msgTypeModelStatus messageType = "modelStatus"
 	msgTypeLogData     messageType = "logData"
 	msgTypeMetrics     messageType = "metrics"
+	msgTypeInFlight    messageType = "inflight"
 )
 
 type messageEnvelope struct {
@@ -164,6 +167,18 @@ func (pm *ProxyManager) apiSendEvents(c *gin.Context) {
 		}
 	}
 
+	sendInFlight := func(total int) {
+		jsonData, err := json.Marshal(gin.H{"total": total})
+		if err == nil {
+			select {
+			case sendBuffer <- messageEnvelope{Type: msgTypeInFlight, Data: string(jsonData)}:
+			case <-ctx.Done():
+				return
+			default:
+			}
+		}
+	}
+
 	/**
 	 * Send updated models list
 	 */
@@ -191,11 +206,19 @@ func (pm *ProxyManager) apiSendEvents(c *gin.Context) {
 		sendMetrics([]TokenMetrics{e.Metrics})
 	})()
 
+	/**
+	 * Send in-flight request stats related to token stats "Waiting: N" count.
+	 */
+	defer event.On(func(e InFlightRequestsEvent) {
+		sendInFlight(e.Total)
+	})()
+
 	// send initial batch of data
 	sendLogData("proxy", pm.proxyLogger.GetHistory())
 	sendLogData("upstream", pm.upstreamLogger.GetHistory())
 	sendModels()
 	sendMetrics(pm.metricsMonitor.getMetrics())
+	sendInFlight(pm.inFlightCounter.Current())
 
 	for {
 		select {
@@ -250,3 +273,20 @@ func (pm *ProxyManager) apiGetVersion(c *gin.Context) {
 		"build_date": pm.buildDate,
 	})
 }
+
+func (pm *ProxyManager) apiGetCapture(c *gin.Context) {
+	idStr := c.Param("id")
+	id, err := strconv.Atoi(idStr)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid capture ID"})
+		return
+	}
+
+	capture := pm.metricsMonitor.getCaptureByID(id)
+	if capture == nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "capture not found"})
+		return
+	}
+
+	c.JSON(http.StatusOK, capture)
+}

proxy/proxymanager_test.go

@@ -850,6 +850,43 @@ func TestProxyManager_UseModelName(t *testing.T) {
 	})
 }
 
+func TestProxyManager_AudioVoicesGETHandler(t *testing.T) {
+	conf := config.AddDefaultGroupToConfig(config.Config{
+		HealthCheckTimeout: 15,
+		Models: map[string]config.ModelConfig{
+			"model1": getTestSimpleResponderConfig("model1"),
+		},
+		LogLevel: "error",
+	})
+
+	proxy := New(conf)
+	defer proxy.StopProcesses(StopWaitForInflightRequest)
+
+	t.Run("successful GET with model query param", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/v1/audio/voices?model=model1", nil)
+		w := CreateTestResponseRecorder()
+		proxy.ServeHTTP(w, req)
+		assert.Equal(t, http.StatusOK, w.Code)
+		assert.Contains(t, w.Body.String(), "voice1")
+	})
+
+	t.Run("missing model query param returns 400", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/v1/audio/voices", nil)
+		w := CreateTestResponseRecorder()
+		proxy.ServeHTTP(w, req)
+		assert.Equal(t, http.StatusBadRequest, w.Code)
+		assert.Contains(t, w.Body.String(), "missing required 'model' query parameter")
+	})
+
+	t.Run("unknown model returns 400", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/v1/audio/voices?model=nonexistent", nil)
+		w := CreateTestResponseRecorder()
+		proxy.ServeHTTP(w, req)
+		assert.Equal(t, http.StatusBadRequest, w.Code)
+		assert.Contains(t, w.Body.String(), "could not find suitable handler")
+	})
+}
+
 func TestProxyManager_CORSOptionsHandler(t *testing.T) {
 	config := config.AddDefaultGroupToConfig(config.Config{
 		HealthCheckTimeout: 15,

proxy/ui_compress.go

@@ -0,0 +1,81 @@
+package proxy
+
+import (
+	"net/http"
+	"strings"
+)
+
+// selectEncoding chooses the best encoding based on Accept-Encoding header
+// Returns the encoding ("br", "gzip", or "") and the corresponding file extension
+func selectEncoding(acceptEncoding string) (encoding, ext string) {
+	if acceptEncoding == "" {
+		return "", ""
+	}
+
+	for _, part := range strings.Split(acceptEncoding, ",") {
+		enc := strings.TrimSpace(strings.SplitN(part, ";", 2)[0])
+		if enc == "br" {
+			return "br", ".br"
+		}
+	}
+
+	for _, part := range strings.Split(acceptEncoding, ",") {
+		enc := strings.TrimSpace(strings.SplitN(part, ";", 2)[0])
+		if enc == "gzip" {
+			return "gzip", ".gz"
+		}
+	}
+
+	return "", ""
+}
+
+// ServeCompressedFile serves a file with compression support.
+// It checks for pre-compressed versions and serves them with proper headers.
+func ServeCompressedFile(fs http.FileSystem, w http.ResponseWriter, r *http.Request, name string) {
+	encoding, ext := selectEncoding(r.Header.Get("Accept-Encoding"))
+
+	// Try to serve compressed version if client supports it
+	if encoding != "" {
+		if cf, err := fs.Open(name + ext); err == nil {
+			defer cf.Close()
+
+			// Verify it's a regular file (not a directory)
+			if stat, err := cf.Stat(); err == nil && !stat.IsDir() {
+				// Set the content encoding header
+				w.Header().Set("Content-Encoding", encoding)
+				w.Header().Add("Vary", "Accept-Encoding")
+
+				// Get original file info for content type detection
+				origFile, err := fs.Open(name)
+				if err == nil {
+					origFile.Close()
+				}
+
+				// Serve the compressed file
+				http.ServeContent(w, r, name, stat.ModTime(), cf)
+				return
+			}
+		}
+	}
+
+	// Fall back to serving the uncompressed file
+	file, err := fs.Open(name)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusNotFound)
+		return
+	}
+	defer file.Close()
+
+	stat, err := file.Stat()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if stat.IsDir() {
+		http.Error(w, "is a directory", http.StatusForbidden)
+		return
+	}
+
+	http.ServeContent(w, r, name, stat.ModTime(), file)
+}

proxy/ui_compress_test.go

@@ -0,0 +1,283 @@
+package proxy
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"testing/fstest"
+	"time"
+)
+
+func TestServeCompressedFile_Brotli(t *testing.T) {
+	// Create test content
+	content := []byte("This is test content that should be compressed with brotli")
+	brContent := []byte("fake-brotli-compressed-data")
+
+	// Create a test filesystem
+	mapFS := fstest.MapFS{
+		"test.js":    {Data: content, ModTime: time.Now()},
+		"test.js.br": {Data: brContent, ModTime: time.Now()},
+		"test.js.gz": {Data: []byte("fake-gzip-data"), ModTime: time.Now()},
+	}
+	fs := http.FS(mapFS)
+
+	req := httptest.NewRequest(http.MethodGet, "/test.js", nil)
+	req.Header.Set("Accept-Encoding", "br, gzip")
+	w := httptest.NewRecorder()
+
+	ServeCompressedFile(fs, w, req, "test.js")
+
+	resp := w.Result()
+	body, _ := io.ReadAll(resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", resp.StatusCode)
+	}
+
+	// Check that brotli is used (preferred over gzip)
+	if encoding := resp.Header.Get("Content-Encoding"); encoding != "br" {
+		t.Errorf("Expected Content-Encoding 'br', got '%s'", encoding)
+	}
+
+	if vary := resp.Header.Get("Vary"); vary != "Accept-Encoding" {
+		t.Errorf("Expected Vary 'Accept-Encoding', got '%s'", vary)
+	}
+
+	if !bytes.Equal(body, brContent) {
+		t.Errorf("Expected brotli content, got %s", string(body))
+	}
+}
+
+func TestServeCompressedFile_Gzip(t *testing.T) {
+	// Create test content
+	content := []byte("This is test content that should be compressed with gzip")
+	gzContent := []byte("fake-gzip-compressed-data")
+
+	// Create a test filesystem without brotli
+	mapFS := fstest.MapFS{
+		"test.js":    {Data: content, ModTime: time.Now()},
+		"test.js.gz": {Data: gzContent, ModTime: time.Now()},
+	}
+	fs := http.FS(mapFS)
+
+	req := httptest.NewRequest(http.MethodGet, "/test.js", nil)
+	req.Header.Set("Accept-Encoding", "gzip")
+	w := httptest.NewRecorder()
+
+	ServeCompressedFile(fs, w, req, "test.js")
+
+	resp := w.Result()
+	body, _ := io.ReadAll(resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", resp.StatusCode)
+	}
+
+	if encoding := resp.Header.Get("Content-Encoding"); encoding != "gzip" {
+		t.Errorf("Expected Content-Encoding 'gzip', got '%s'", encoding)
+	}
+
+	if !bytes.Equal(body, gzContent) {
+		t.Errorf("Expected gzip content, got %s", string(body))
+	}
+}
+
+func TestServeCompressedFile_UncompressedFallback(t *testing.T) {
+	// Create test content
+	content := []byte("This is uncompressed test content")
+
+	// Create a test filesystem without compressed versions
+	mapFS := fstest.MapFS{
+		"test.js": {Data: content, ModTime: time.Now()},
+	}
+	fs := http.FS(mapFS)
+
+	req := httptest.NewRequest(http.MethodGet, "/test.js", nil)
+	req.Header.Set("Accept-Encoding", "br, gzip")
+	w := httptest.NewRecorder()
+
+	ServeCompressedFile(fs, w, req, "test.js")
+
+	resp := w.Result()
+	body, _ := io.ReadAll(resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", resp.StatusCode)
+	}
+
+	// Should not have Content-Encoding header since we're serving uncompressed
+	if encoding := resp.Header.Get("Content-Encoding"); encoding != "" {
+		t.Errorf("Expected no Content-Encoding, got '%s'", encoding)
+	}
+
+	if !bytes.Equal(body, content) {
+		t.Errorf("Expected original content, got %s", string(body))
+	}
+}
+
+func TestServeCompressedFile_NoAcceptEncoding(t *testing.T) {
+	// Create test content
+	content := []byte("This is test content")
+
+	// Create a test filesystem with compressed versions
+	mapFS := fstest.MapFS{
+		"test.js":    {Data: content, ModTime: time.Now()},
+		"test.js.br": {Data: []byte("brotli"), ModTime: time.Now()},
+		"test.js.gz": {Data: []byte("gzip"), ModTime: time.Now()},
+	}
+	fs := http.FS(mapFS)
+
+	req := httptest.NewRequest(http.MethodGet, "/test.js", nil)
+	// No Accept-Encoding header
+	w := httptest.NewRecorder()
+
+	ServeCompressedFile(fs, w, req, "test.js")
+
+	resp := w.Result()
+	body, _ := io.ReadAll(resp.Body)
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", resp.StatusCode)
+	}
+
+	// Should serve uncompressed content
+	if encoding := resp.Header.Get("Content-Encoding"); encoding != "" {
+		t.Errorf("Expected no Content-Encoding, got '%s'", encoding)
+	}
+
+	if !bytes.Equal(body, content) {
+		t.Errorf("Expected original content, got %s", string(body))
+	}
+}
+
+func TestServeCompressedFile_NotFound(t *testing.T) {
+	mapFS := fstest.MapFS{}
+	fs := http.FS(mapFS)
+
+	req := httptest.NewRequest(http.MethodGet, "/nonexistent.js", nil)
+	w := httptest.NewRecorder()
+
+	ServeCompressedFile(fs, w, req, "nonexistent.js")
+
+	resp := w.Result()
+
+	if resp.StatusCode != http.StatusNotFound {
+		t.Errorf("Expected status 404, got %d", resp.StatusCode)
+	}
+}
+
+func TestSelectEncoding(t *testing.T) {
+	tests := []struct {
+		acceptEncoding string
+		wantEncoding   string
+		wantExt        string
+	}{
+		{"br, gzip", "br", ".br"},
+		{"gzip, deflate", "gzip", ".gz"},
+		{"gzip", "gzip", ".gz"},
+		{"br", "br", ".br"},
+		{"", "", ""},
+		{"deflate", "", ""},
+		{"br;q=1.0, gzip;q=0.5", "br", ".br"},
+		{"gzip;q=1.0, br;q=0.5", "br", ".br"},
+		{"browser", "", ""},
+		{"compress, deflate", "", ""},
+	}
+
+	for _, tt := range tests {
+		gotEncoding, gotExt := selectEncoding(tt.acceptEncoding)
+		if gotEncoding != tt.wantEncoding || gotExt != tt.wantExt {
+			t.Errorf("selectEncoding(%q) = (%q, %q), want (%q, %q)",
+				tt.acceptEncoding, gotEncoding, gotExt, tt.wantEncoding, tt.wantExt)
+		}
+	}
+}
+
+// Test with actual pre-compressed files from ui_dist
+func TestServeCompressedFile_RealFiles(t *testing.T) {
+	// Check if ui_dist exists
+	if _, err := os.Stat("./ui_dist"); os.IsNotExist(err) {
+		t.Skip("ui_dist not found, skipping real file test")
+	}
+
+	// Find a .js or .css file that has compressed versions
+	entries, err := os.ReadDir("./ui_dist/assets")
+	if err != nil {
+		t.Skipf("Could not read ui_dist/assets: %v", err)
+	}
+
+	var testFile string
+	for _, entry := range entries {
+		name := entry.Name()
+		if strings.HasSuffix(name, ".js") && !strings.HasSuffix(name, ".js.gz") && !strings.HasSuffix(name, ".js.br") {
+			// Check if compressed versions exist
+			base := strings.TrimSuffix(name, ".js")
+			if _, err := os.Stat(filepath.Join("./ui_dist/assets", base+".js.gz")); err == nil {
+				testFile = "assets/" + name
+				break
+			}
+		}
+	}
+
+	if testFile == "" {
+		t.Skip("No suitable test file found with compressed versions")
+	}
+
+	fs := http.FS(os.DirFS("./ui_dist"))
+
+	// Test brotli
+	t.Run("brotli", func(t *testing.T) {
+		req := httptest.NewRequest(http.MethodGet, "/"+testFile, nil)
+		req.Header.Set("Accept-Encoding", "br")
+		w := httptest.NewRecorder()
+
+		ServeCompressedFile(fs, w, req, testFile)
+
+		resp := w.Result()
+		if resp.StatusCode != http.StatusOK {
+			t.Fatalf("Expected status 200, got %d", resp.StatusCode)
+		}
+
+		if encoding := resp.Header.Get("Content-Encoding"); encoding != "br" {
+			t.Errorf("Expected Content-Encoding 'br', got '%s'", encoding)
+		}
+	})
+
+	// Test gzip
+	t.Run("gzip", func(t *testing.T) {
+		req := httptest.NewRequest(http.MethodGet, "/"+testFile, nil)
+		req.Header.Set("Accept-Encoding", "gzip")
+		w := httptest.NewRecorder()
+
+		ServeCompressedFile(fs, w, req, testFile)
+
+		resp := w.Result()
+		if resp.StatusCode != http.StatusOK {
+			t.Fatalf("Expected status 200, got %d", resp.StatusCode)
+		}
+
+		if encoding := resp.Header.Get("Content-Encoding"); encoding != "gzip" {
+			t.Errorf("Expected Content-Encoding 'gzip', got '%s'", encoding)
+		}
+
+		// Verify it's valid gzip
+		reader, err := gzip.NewReader(resp.Body)
+		if err != nil {
+			t.Errorf("Expected valid gzip content: %v", err)
+			return
+		}
+		defer reader.Close()
+
+		// Just read to verify it's valid
+		_, err = io.Copy(io.Discard, reader)
+		if err != nil {
+			t.Errorf("Failed to decompress gzip: %v", err)
+		}
+	})
+}

ui-svelte/package.json

@@ -7,19 +7,36 @@
     "start": "vite",
     "build": "vite build --emptyOutDir",
     "preview": "vite preview",
-    "check": "svelte-check --tsconfig ./tsconfig.json"
+    "check": "svelte-check --tsconfig ./tsconfig.json",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^5.0.3",
     "@tailwindcss/vite": "^4.1.8",
     "@tsconfig/svelte": "^5.0.4",
+    "@types/hast": "^3.0.4",
+    "@types/node": "^25.1.0",
     "svelte": "^5.19.0",
     "svelte-check": "^4.1.4",
     "tailwindcss": "^4.1.8",
     "typescript": "~5.8.3",
-    "vite": "^6.3.5"
+    "vite": "^6.3.5",
+    "vite-plugin-compression2": "^2.4.0",
+    "vitest": "^4.0.18"
   },
   "dependencies": {
-    "svelte-spa-router": "^4.0.1"
+    "highlight.js": "^11.11.1",
+    "katex": "^0.16.28",
+    "lucide-svelte": "^0.563.0",
+    "rehype-katex": "^7.0.1",
+    "rehype-stringify": "^10.0.1",
+    "remark-gfm": "^4.0.1",
+    "remark-math": "^6.0.0",
+    "remark-parse": "^11.0.0",
+    "remark-rehype": "^11.1.2",
+    "svelte-spa-router": "^4.0.1",
+    "unified": "^11.0.5",
+    "unist-util-visit": "^5.1.0"
   }
 }

ui-svelte/src/App.svelte

@@ -5,22 +5,29 @@
   import LogViewer from "./routes/LogViewer.svelte";
   import Models from "./routes/Models.svelte";
   import Activity from "./routes/Activity.svelte";
+  import Playground from "./routes/Playground.svelte";
+  import PlaygroundStub from "./routes/PlaygroundStub.svelte";
   import { enableAPIEvents } from "./stores/api";
   import { initScreenWidth, isDarkMode, appTitle, connectionState } from "./stores/theme";
+  import { currentRoute } from "./stores/route";
 
   const routes = {
-    "/": Models,
+    "/": PlaygroundStub,
+    "/models": Models,
     "/logs": LogViewer,
     "/activity": Activity,
-    "*": Models,
+    "*": PlaygroundStub,
   };
 
-  // Sync theme to document attribute
+  function handleRouteLoaded(event: { detail: { route: string | RegExp } }) {
+    const route = event.detail.route;
+    currentRoute.set(typeof route === "string" ? route : "/");
+  }
+
   $effect(() => {
     document.documentElement.setAttribute("data-theme", $isDarkMode ? "dark" : "light");
   });
 
-  // Sync title to document
   $effect(() => {
     const icon = $connectionState === "connecting" ? "\u{1F7E1}" : $connectionState === "connected" ? "\u{1F7E2}" : "\u{1F534}";
     document.title = `${icon} ${$appTitle}`;
@@ -41,6 +48,11 @@
   <Header />
 
   <main class="flex-1 overflow-auto p-4">
-    <Router {routes} />
+    <div class="h-full" class:hidden={$currentRoute !== "/"}>
+      <Playground />
+    </div>
+    <div class="h-full" class:hidden={$currentRoute === "/"}>
+      <Router {routes} on:routeLoaded={handleRouteLoaded} />
+    </div>
   </main>
 </div>

ui-svelte/src/components/CaptureDialog.svelte

@@ -0,0 +1,452 @@
+<script lang="ts">
+  import type { ReqRespCapture } from "../lib/types";
+
+  interface Props {
+    capture: ReqRespCapture | null;
+    open: boolean;
+    onclose: () => void;
+  }
+
+  let { capture, open, onclose }: Props = $props();
+
+  let dialogEl: HTMLDialogElement | undefined = $state();
+
+  type BodyTab = "raw" | "pretty" | "chat";
+  let reqBodyTab: BodyTab = $state("pretty");
+  let respBodyTab: BodyTab = $state("pretty");
+  let copiedReq = $state(false);
+  let copiedResp = $state(false);
+
+  $effect(() => {
+    if (open && dialogEl) {
+      dialogEl.showModal();
+    } else if (!open && dialogEl) {
+      dialogEl.close();
+    }
+  });
+
+  // Reset tabs when capture changes
+  $effect(() => {
+    if (capture) {
+      const reqCt = getContentType(capture.req_headers);
+      const respCt = getContentType(capture.resp_headers);
+      reqBodyTab = reqCt.includes("json") ? "pretty" : "raw";
+      respBodyTab = respCt.includes("text/event-stream")
+        ? "chat"
+        : respCt.includes("json")
+          ? "pretty"
+          : "raw";
+    }
+  });
+
+  function handleDialogClose() {
+    onclose();
+  }
+
+  function decodeBody(body: string | null | undefined): string {
+    if (!body) return "";
+    try {
+      const binary = atob(body);
+      const bytes = Uint8Array.from(binary, (c) => c.charCodeAt(0));
+      return new TextDecoder().decode(bytes);
+    } catch {
+      return body;
+    }
+  }
+
+  function formatJson(str: string): string {
+    try {
+      const parsed = JSON.parse(str);
+      return JSON.stringify(parsed, null, 2);
+    } catch {
+      return str;
+    }
+  }
+
+  function getContentType(
+    headers: Record<string, string> | null | undefined,
+  ): string {
+    if (!headers) return "";
+    const ct = headers["Content-Type"] || headers["content-type"] || "";
+    return ct.toLowerCase();
+  }
+
+  function isImageContentType(contentType: string): boolean {
+    return contentType.startsWith("image/");
+  }
+
+  function isTextContentType(contentType: string): boolean {
+    return (
+      contentType.startsWith("text/") ||
+      contentType.includes("application/json") ||
+      contentType.includes("application/xml") ||
+      contentType.includes("application/javascript")
+    );
+  }
+
+  function getImageDataUrl(body: string, contentType: string): string {
+    const mimeType = contentType.split(";")[0].trim();
+    return `data:${mimeType};base64,${body}`;
+  }
+
+  interface SSEChat {
+    reasoning: string;
+    content: string;
+  }
+
+  function parseSSEChat(text: string): SSEChat {
+    const result: SSEChat = { reasoning: "", content: "" };
+    for (const line of text.split("\n")) {
+      const trimmed = line.trim();
+      if (!trimmed || !trimmed.startsWith("data: ")) continue;
+      const data = trimmed.slice(6);
+      if (data === "[DONE]") continue;
+      try {
+        const parsed = JSON.parse(data);
+        const delta = parsed.choices?.[0]?.delta;
+        if (delta?.content) result.content += delta.content;
+        if (delta?.reasoning_content) result.reasoning += delta.reasoning_content;
+      } catch {
+        // skip unparseable lines
+      }
+    }
+    return result;
+  }
+
+  async function copyToClipboard(text: string, type: "req" | "resp") {
+    try {
+      await navigator.clipboard.writeText(text);
+      if (type === "req") {
+        copiedReq = true;
+        setTimeout(() => (copiedReq = false), 1500);
+      } else {
+        copiedResp = true;
+        setTimeout(() => (copiedResp = false), 1500);
+      }
+    } catch {
+      // ignore
+    }
+  }
+
+  function getCopyText(): string {
+    if (respBodyTab === "chat") {
+      let text = "";
+      if (sseChat.reasoning) text += sseChat.reasoning + "\n\n";
+      text += sseChat.content;
+      return text;
+    }
+    return displayedResponseBody;
+  }
+
+  // Request body derivations
+  let requestContentType = $derived(
+    capture ? getContentType(capture.req_headers) : "",
+  );
+  let isRequestJson = $derived(requestContentType.includes("json"));
+
+  let requestBodyRaw = $derived.by(() => {
+    if (!capture) return "";
+    return decodeBody(capture.req_body);
+  });
+
+  let requestBodyPretty = $derived.by(() => {
+    if (!isRequestJson) return requestBodyRaw;
+    return formatJson(requestBodyRaw);
+  });
+
+  let displayedRequestBody = $derived(
+    reqBodyTab === "pretty" ? requestBodyPretty : requestBodyRaw,
+  );
+
+  // Response body derivations
+  let responseContentType = $derived(
+    capture ? getContentType(capture.resp_headers) : "",
+  );
+  let isResponseImage = $derived(isImageContentType(responseContentType));
+  let isResponseText = $derived(isTextContentType(responseContentType));
+  let isResponseJson = $derived(responseContentType.includes("json"));
+  let isSSE = $derived(responseContentType.includes("text/event-stream"));
+
+  let responseBodyRaw = $derived.by(() => {
+    if (!capture) return "";
+    return decodeBody(capture.resp_body);
+  });
+
+  let responseBodyPretty = $derived.by(() => {
+    if (!isResponseJson) return responseBodyRaw;
+    return formatJson(responseBodyRaw);
+  });
+
+  let sseChat = $derived.by(() => {
+    if (!isSSE || !responseBodyRaw)
+      return { reasoning: "", content: "" } as SSEChat;
+    return parseSSEChat(responseBodyRaw);
+  });
+
+  let displayedResponseBody = $derived.by(() => {
+    if (respBodyTab === "pretty") return responseBodyPretty;
+    return responseBodyRaw;
+  });
+</script>
+
+<dialog
+  bind:this={dialogEl}
+  onclose={handleDialogClose}
+  class="bg-surface text-txtmain rounded-lg shadow-xl max-w-4xl w-full max-h-[90vh] p-0 backdrop:bg-black/50 m-auto"
+>
+  {#if capture}
+    <div class="flex flex-col max-h-[90vh]">
+      <div
+        class="flex justify-between items-center p-4 border-b border-card-border"
+      >
+        <h2 class="text-xl font-bold pb-0">Capture #{capture.id + 1}{#if capture.req_path} <span class="text-base font-mono font-normal text-txtsecondary">{capture.req_path}</span>{/if}</h2>
+        <button
+          onclick={() => dialogEl?.close()}
+          class="text-txtsecondary hover:text-txtmain text-2xl leading-none"
+        >
+          &times;
+        </button>
+      </div>
+
+      <div class="overflow-y-auto flex-1 p-4 space-y-4">
+        <!-- Request Headers -->
+        <details class="group" open>
+          <summary
+            class="cursor-pointer font-semibold text-sm uppercase tracking-wider text-txtsecondary hover:text-txtmain"
+          >
+            Request Headers
+          </summary>
+          <div
+            class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-48"
+          >
+            <table class="w-full text-sm">
+              <tbody>
+                {#each Object.entries(capture.req_headers || {}) as [key, value]}
+                  <tr class="border-b border-card-border-inner last:border-0">
+                    <td class="px-3 py-1 font-mono text-primary whitespace-nowrap"
+                      >{key}</td
+                    >
+                    <td class="px-3 py-1 font-mono break-all">{value}</td>
+                  </tr>
+                {/each}
+              </tbody>
+            </table>
+          </div>
+        </details>
+
+        <!-- Request Body -->
+        <details class="group" open>
+          <summary
+            class="cursor-pointer font-semibold text-sm uppercase tracking-wider text-txtsecondary hover:text-txtmain"
+          >
+            Request Body
+          </summary>
+          {#if requestBodyRaw}
+            <div class="mt-2 flex items-center justify-between">
+              <div class="flex gap-1">
+                {#if isRequestJson}
+                  <button
+                    class="tab-btn"
+                    class:tab-btn-active={reqBodyTab === "pretty"}
+                    onclick={() => (reqBodyTab = "pretty")}>Pretty</button
+                  >
+                  <button
+                    class="tab-btn"
+                    class:tab-btn-active={reqBodyTab === "raw"}
+                    onclick={() => (reqBodyTab = "raw")}>Raw</button
+                  >
+                {/if}
+              </div>
+              <button
+                class="tab-btn"
+                onclick={() =>
+                  copyToClipboard(displayedRequestBody, "req")}
+              >
+                {#if copiedReq}
+                  Copied!
+                {:else}
+                  Copy
+                {/if}
+              </button>
+            </div>
+            <div
+              class="mt-1 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              <pre
+                class="p-3 text-sm font-mono whitespace-pre-wrap break-all">{displayedRequestBody}</pre>
+            </div>
+          {:else}
+            <div
+              class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              <pre class="p-3 text-sm font-mono whitespace-pre-wrap break-all"
+                >(empty)</pre
+              >
+            </div>
+          {/if}
+        </details>
+
+        <!-- Response Headers -->
+        <details class="group" open>
+          <summary
+            class="cursor-pointer font-semibold text-sm uppercase tracking-wider text-txtsecondary hover:text-txtmain"
+          >
+            Response Headers
+          </summary>
+          <div
+            class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-48"
+          >
+            <table class="w-full text-sm">
+              <tbody>
+                {#each Object.entries(capture.resp_headers || {}) as [key, value]}
+                  <tr class="border-b border-card-border-inner last:border-0">
+                    <td class="px-3 py-1 font-mono text-primary whitespace-nowrap"
+                      >{key}</td
+                    >
+                    <td class="px-3 py-1 font-mono break-all">{value}</td>
+                  </tr>
+                {/each}
+              </tbody>
+            </table>
+          </div>
+        </details>
+
+        <!-- Response Body -->
+        <details class="group" open>
+          <summary
+            class="cursor-pointer font-semibold text-sm uppercase tracking-wider text-txtsecondary hover:text-txtmain"
+          >
+            Response Body
+          </summary>
+          {#if isResponseImage && capture.resp_body}
+            <div
+              class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              <div class="p-3 flex justify-center">
+                <img
+                  src={getImageDataUrl(capture.resp_body, responseContentType)}
+                  alt="Response"
+                  class="max-w-full h-auto"
+                />
+              </div>
+            </div>
+          {:else if isSSE || isResponseText}
+            <div class="mt-2 flex items-center justify-between">
+              <div class="flex gap-1">
+                {#if isSSE}
+                  <button
+                    class="tab-btn"
+                    class:tab-btn-active={respBodyTab === "chat"}
+                    onclick={() => (respBodyTab = "chat")}>Chat</button
+                  >
+                {/if}
+                {#if isResponseJson}
+                  <button
+                    class="tab-btn"
+                    class:tab-btn-active={respBodyTab === "pretty"}
+                    onclick={() => (respBodyTab = "pretty")}>Pretty</button
+                  >
+                {/if}
+                {#if isSSE || isResponseJson}
+                  <button
+                    class="tab-btn"
+                    class:tab-btn-active={respBodyTab === "raw"}
+                    onclick={() => (respBodyTab = "raw")}>Raw</button
+                  >
+                {/if}
+              </div>
+              <button
+                class="tab-btn"
+                onclick={() => copyToClipboard(getCopyText(), "resp")}
+              >
+                {#if copiedResp}
+                  Copied!
+                {:else}
+                  Copy
+                {/if}
+              </button>
+            </div>
+            <div
+              class="mt-1 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              {#if respBodyTab === "chat"}
+                <div class="p-3 text-sm space-y-3">
+                  {#if sseChat.reasoning}
+                    <div>
+                      <div
+                        class="text-xs font-semibold uppercase tracking-wider text-txtsecondary mb-1"
+                      >
+                        Reasoning
+                      </div>
+                      <pre
+                        class="font-mono whitespace-pre-wrap break-all text-txtsecondary">{sseChat.reasoning}</pre>
+                    </div>
+                  {/if}
+                  {#if sseChat.content}
+                    <div>
+                      {#if sseChat.reasoning}
+                        <div
+                          class="text-xs font-semibold uppercase tracking-wider text-txtsecondary mb-1"
+                        >
+                          Response
+                        </div>
+                      {/if}
+                      <pre
+                        class="font-mono whitespace-pre-wrap break-all">{sseChat.content}</pre>
+                    </div>
+                  {/if}
+                  {#if !sseChat.reasoning && !sseChat.content}
+                    <pre class="font-mono">(empty)</pre>
+                  {/if}
+                </div>
+              {:else}
+                <pre
+                  class="p-3 text-sm font-mono whitespace-pre-wrap break-all">{displayedResponseBody || "(empty)"}</pre>
+              {/if}
+            </div>
+          {:else if responseBodyRaw}
+            <div
+              class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              <div class="p-3 text-sm text-txtsecondary italic">
+                (binary data - {responseContentType || "unknown content type"})
+              </div>
+            </div>
+          {:else}
+            <div
+              class="mt-2 bg-background rounded border border-card-border overflow-auto max-h-96"
+            >
+              <pre class="p-3 text-sm font-mono">(empty)</pre>
+            </div>
+          {/if}
+        </details>
+      </div>
+
+      <div class="p-4 border-t border-card-border flex justify-end">
+        <button onclick={() => dialogEl?.close()} class="btn"> Close </button>
+      </div>
+    </div>
+  {/if}
+</dialog>
+
+<style>
+  .tab-btn {
+    padding: 2px 10px;
+    font-size: 0.75rem;
+    border-radius: 4px;
+    color: var(--color-txtsecondary);
+    cursor: pointer;
+    border: 1px solid transparent;
+    background: transparent;
+    transition: all 0.15s;
+  }
+  .tab-btn:hover {
+    color: var(--color-txtmain);
+    background: var(--color-secondary);
+  }
+  .tab-btn-active {
+    color: var(--color-primary);
+    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
+    border-color: color-mix(in srgb, var(--color-primary) 25%, transparent);
+  }
+</style>

ui-svelte/src/components/Header.svelte

@@ -1,6 +1,8 @@
 <script lang="ts">
-  import { link, location } from "svelte-spa-router";
+  import { link } from "svelte-spa-router";
   import { screenWidth, toggleTheme, isDarkMode, appTitle, isNarrow } from "../stores/theme";
+  import { currentRoute } from "../stores/route";
+  import { playgroundActivity } from "../stores/playgroundActivity";
   import ConnectionStatus from "./ConnectionStatus.svelte";
 
   function handleTitleChange(newTitle: string): void {
@@ -22,9 +24,10 @@
     handleTitleChange(target.textContent || "(set title)");
   }
 
-  function isActive(path: string, currentLocation: string): boolean {
-    return path === "/" ? currentLocation === "/" : currentLocation.startsWith(path);
+  function isActive(path: string, current: string): boolean {
+    return path === "/" ? current === "/" : current.startsWith(path);
   }
+
 </script>
 
 <header
@@ -43,28 +46,35 @@
     </h1>
   {/if}
 
-  <menu class="flex items-center gap-4">
+  <menu class="flex items-center gap-4 overflow-x-auto">
     <a
       href="/"
       use:link
-      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1"
-      class:font-semibold={isActive("/", $location)}
+      class="p-1 whitespace-nowrap {isActive('/', $currentRoute) ? 'font-semibold' : ''} {$playgroundActivity ? 'activity-link' : 'text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100'}"
+    >
+      Playground
+    </a>
+    <a
+      href="/models"
+      use:link
+      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1 whitespace-nowrap"
+      class:font-semibold={isActive("/models", $currentRoute)}
     >
       Models
     </a>
     <a
       href="/activity"
       use:link
-      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1"
-      class:font-semibold={isActive("/activity", $location)}
+      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1 whitespace-nowrap"
+      class:font-semibold={isActive("/activity", $currentRoute)}
     >
       Activity
     </a>
     <a
       href="/logs"
       use:link
-      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1"
-      class:font-semibold={isActive("/logs", $location)}
+      class="text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1 whitespace-nowrap"
+      class:font-semibold={isActive("/logs", $currentRoute)}
     >
       Logs
     </a>
@@ -88,3 +98,23 @@
     <ConnectionStatus />
   </menu>
 </header>
+
+<style>
+  .activity-link {
+    background: linear-gradient(90deg, #6366f1, #8b5cf6, #a855f7, #8b5cf6, #6366f1);
+    background-size: 200% 100%;
+    -webkit-background-clip: text;
+    background-clip: text;
+    -webkit-text-fill-color: transparent;
+    animation: gradient-shift 2s linear infinite;
+  }
+
+  @keyframes gradient-shift {
+    0% {
+      background-position: 0% 50%;
+    }
+    100% {
+      background-position: 200% 50%;
+    }
+  }
+</style>

ui-svelte/src/components/StatsPanel.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { metrics } from "../stores/api";
+  import { inFlightRequests, metrics } from "../stores/api";
   import TokenHistogram from "./TokenHistogram.svelte";
 
   interface HistogramData {
@@ -15,7 +15,14 @@
   let stats = $derived.by(() => {
     const totalRequests = $metrics.length;
     if (totalRequests === 0) {
-      return { totalRequests: 0, totalInputTokens: 0, totalOutputTokens: 0, tokenStats: { p99: "0", p95: "0", p50: "0" }, histogramData: null };
+      return {
+        totalRequests: 0,
+        totalInputTokens: 0,
+        totalOutputTokens: 0,
+        inFlightRequests: $inFlightRequests,
+        tokenStats: { p99: "0", p95: "0", p50: "0" },
+        histogramData: null,
+      };
     }
 
     const totalInputTokens = $metrics.reduce((sum, m) => sum + m.input_tokens, 0);
@@ -24,7 +31,14 @@
     // Calculate token statistics using output_tokens and duration_ms
     const validMetrics = $metrics.filter((m) => m.duration_ms > 0 && m.output_tokens > 0);
     if (validMetrics.length === 0) {
-      return { totalRequests, totalInputTokens, totalOutputTokens, tokenStats: { p99: "0", p95: "0", p50: "0" }, histogramData: null };
+      return {
+        totalRequests,
+        totalInputTokens,
+        totalOutputTokens,
+        inFlightRequests: $inFlightRequests,
+        tokenStats: { p99: "0", p95: "0", p50: "0" },
+        histogramData: null,
+      };
     }
 
     // Calculate tokens/second for each valid metric
@@ -63,6 +77,7 @@
       totalRequests,
       totalInputTokens,
       totalOutputTokens,
+      inFlightRequests: $inFlightRequests,
       tokenStats: {
         p99: p99.toFixed(2),
         p95: p95.toFixed(2),
@@ -95,7 +110,12 @@
 
       <tbody class="bg-surface divide-y divide-card-border-inner">
         <tr class="hover:bg-secondary">
-          <td class="px-4 py-4 text-sm font-semibold text-gray-900 dark:text-white">{stats.totalRequests}</td>
+          <td class="px-4 py-4 text-sm font-semibold text-gray-900 dark:text-white">
+            <div class="flex flex-col gap-1">
+              <span class="text-xs font-medium text-gray-500 dark:text-gray-400">Completed: {nf.format(stats.totalRequests)}</span>
+              <span class="text-xs font-medium text-gray-500 dark:text-gray-400">Waiting: {nf.format(stats.inFlightRequests)}</span>
+            </div>
+          </td>
 
           <td class="px-4 py-4 text-sm text-gray-700 dark:text-gray-300 border-l border-gray-200 dark:border-white/10">
             <div class="flex items-center gap-2">

ui-svelte/src/components/playground/AudioInterface.svelte

@@ -0,0 +1,256 @@
+<script lang="ts">
+  import { models } from "../../stores/api";
+  import { persistentStore } from "../../stores/persistent";
+  import { transcribeAudio } from "../../lib/audioApi";
+  import { playgroundStores } from "../../stores/playgroundActivity";
+  import ModelSelector from "./ModelSelector.svelte";
+
+  const selectedModelStore = persistentStore<string>("playground-audio-model", "");
+
+  let selectedFile = $state<File | null>(null);
+  let isTranscribing = $state(false);
+  let transcriptionResult = $state<string | null>(null);
+  let error = $state<string | null>(null);
+  let abortController = $state<AbortController | null>(null);
+  let isDragging = $state(false);
+  let fileInput = $state<HTMLInputElement | null>(null);
+  let copied = $state(false);
+
+  const ACCEPTED_FORMATS = ['.mp3', '.wav'];
+  const MAX_FILE_SIZE = 25 * 1024 * 1024; // 25MB
+
+  let hasModels = $derived($models.some((m) => !m.unlisted));
+
+  let canTranscribe = $derived(selectedFile !== null && $selectedModelStore !== "" && !isTranscribing);
+
+  $effect(() => {
+    playgroundStores.audioTranscribing.set(isTranscribing);
+  });
+
+  function validateFile(file: File): { valid: boolean; error?: string } {
+    const ext = '.' + file.name.split('.').pop()?.toLowerCase();
+
+    if (!ACCEPTED_FORMATS.includes(ext)) {
+      return { valid: false, error: 'Invalid file type. Accepted: MP3, WAV' };
+    }
+
+    if (file.size > MAX_FILE_SIZE) {
+      return { valid: false, error: 'File too large. Maximum: 25MB' };
+    }
+
+    return { valid: true };
+  }
+
+  function handleFileSelect(event: Event) {
+    const target = event.target as HTMLInputElement;
+    const file = target.files?.[0];
+    if (file) {
+      const validation = validateFile(file);
+      if (validation.valid) {
+        selectedFile = file;
+        error = null;
+        transcriptionResult = null;
+      } else {
+        error = validation.error || "Invalid file";
+        selectedFile = null;
+      }
+    }
+  }
+
+  function handleDragOver(event: DragEvent) {
+    event.preventDefault();
+    isDragging = true;
+  }
+
+  function handleDragLeave() {
+    isDragging = false;
+  }
+
+  function handleDrop(event: DragEvent) {
+    event.preventDefault();
+    isDragging = false;
+
+    const file = event.dataTransfer?.files[0];
+    if (file) {
+      const validation = validateFile(file);
+      if (validation.valid) {
+        selectedFile = file;
+        error = null;
+        transcriptionResult = null;
+      } else {
+        error = validation.error || "Invalid file";
+        selectedFile = null;
+      }
+    }
+  }
+
+  async function transcribe() {
+    if (!selectedFile || !$selectedModelStore || isTranscribing) return;
+
+    isTranscribing = true;
+    error = null;
+    transcriptionResult = null;
+    abortController = new AbortController();
+
+    try {
+      const response = await transcribeAudio(
+        $selectedModelStore,
+        selectedFile,
+        abortController.signal
+      );
+
+      transcriptionResult = response.text;
+    } catch (err) {
+      if (err instanceof Error && err.name === "AbortError") {
+        // User cancelled
+      } else {
+        error = err instanceof Error ? err.message : "An error occurred";
+      }
+    } finally {
+      isTranscribing = false;
+      abortController = null;
+    }
+  }
+
+  function cancelTranscription() {
+    abortController?.abort();
+  }
+
+  function clearAll() {
+    selectedFile = null;
+    transcriptionResult = null;
+    error = null;
+    if (fileInput) {
+      fileInput.value = '';
+    }
+  }
+
+  function copyToClipboard() {
+    if (transcriptionResult) {
+      navigator.clipboard.writeText(transcriptionResult);
+      copied = true;
+      setTimeout(() => {
+        copied = false;
+      }, 2000);
+    }
+  }
+
+  function formatFileSize(bytes: number): string {
+    if (bytes < 1024) return bytes + ' B';
+    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
+    return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
+  }
+</script>
+
+<div class="flex flex-col h-full">
+  <!-- Model selector -->
+  <div class="shrink-0 flex flex-wrap gap-2 mb-4">
+    <ModelSelector bind:value={$selectedModelStore} placeholder="Select an audio model..." disabled={isTranscribing} />
+  </div>
+
+  <!-- Empty state for no models configured -->
+  {#if !hasModels}
+    <div class="flex-1 flex items-center justify-center text-txtsecondary">
+      <p>No models configured. Add models to your configuration to transcribe audio.</p>
+    </div>
+  {:else}
+    <!-- File upload / Result display area -->
+    <div class="flex-1 overflow-auto mb-4 flex items-center justify-center bg-surface border border-gray-200 dark:border-white/10 rounded">
+      {#if isTranscribing}
+        <div class="text-center text-txtsecondary">
+          <div class="inline-block w-8 h-8 border-4 border-primary border-t-transparent rounded-full animate-spin mb-2"></div>
+          <p>Transcribing audio...</p>
+        </div>
+      {:else if error}
+        <div class="text-center text-red-500 p-4">
+          <p class="font-medium">Error</p>
+          <p class="text-sm mt-1">{error}</p>
+        </div>
+      {:else if transcriptionResult}
+        <div class="w-full h-full flex flex-col p-4">
+          <div class="flex justify-between items-center mb-2">
+            <h3 class="font-medium">Transcription Result</h3>
+            <button
+              class="btn btn-sm"
+              onclick={copyToClipboard}
+              title={copied ? 'Copied!' : 'Copy to clipboard'}
+            >
+              {#if copied}
+                <svg class="w-5 h-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+                </svg>
+              {:else}
+                <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
+                </svg>
+              {/if}
+            </button>
+          </div>
+          <div class="flex-1 overflow-auto p-3 rounded border border-gray-200 dark:border-white/10 bg-background whitespace-pre-wrap">
+            {transcriptionResult}
+          </div>
+        </div>
+      {:else if selectedFile}
+        <div class="text-center text-txtsecondary p-4">
+          <p class="font-medium mb-2">File Selected</p>
+          <p class="text-sm">{selectedFile.name}</p>
+          <p class="text-xs mt-1">{formatFileSize(selectedFile.size)}</p>
+        </div>
+      {:else}
+        <div
+          role="region"
+          aria-label="Audio file drop zone"
+          class="w-full h-full flex items-center justify-center text-center text-txtsecondary p-8 {isDragging ? 'bg-primary/10' : ''}"
+          ondragover={handleDragOver}
+          ondragleave={handleDragLeave}
+          ondrop={handleDrop}
+        >
+          <div>
+            <p class="mb-2">Drag and drop an audio file here</p>
+            <p class="text-sm">or use the Browse button below</p>
+            <p class="text-xs mt-4">Accepted formats: MP3, WAV (max 25MB)</p>
+          </div>
+        </div>
+      {/if}
+    </div>
+
+    <!-- File input and transcribe button -->
+    <div class="shrink-0 flex gap-2">
+      <input
+        type="file"
+        accept=".mp3,.wav"
+        class="hidden"
+        onchange={handleFileSelect}
+        bind:this={fileInput}
+      />
+      <button
+        class="btn"
+        onclick={() => fileInput?.click()}
+        disabled={isTranscribing}
+      >
+        Browse Files
+      </button>
+      <div class="flex-1"></div>
+      {#if isTranscribing}
+        <button class="btn bg-red-500 hover:bg-red-600 text-white" onclick={cancelTranscription}>
+          Cancel
+        </button>
+      {:else}
+        <button
+          class="btn bg-primary text-btn-primary-text hover:opacity-90"
+          onclick={transcribe}
+          disabled={!canTranscribe}
+        >
+          Transcribe
+        </button>
+        <button
+          class="btn"
+          onclick={clearAll}
+          disabled={!selectedFile && !transcriptionResult && !error}
+        >
+          Clear
+        </button>
+      {/if}
+    </div>
+  {/if}
+</div>

ui-svelte/src/components/playground/ChatInterface.svelte

@@ -0,0 +1,466 @@
+<script lang="ts">
+  import { models } from "../../stores/api";
+  import { persistentStore } from "../../stores/persistent";
+  import { streamChatCompletion } from "../../lib/chatApi";
+  import { playgroundStores } from "../../stores/playgroundActivity";
+  import type { ChatMessage, ContentPart } from "../../lib/types";
+  import ChatMessageComponent from "./ChatMessage.svelte";
+  import ModelSelector from "./ModelSelector.svelte";
+  import ExpandableTextarea from "./ExpandableTextarea.svelte";
+
+  const selectedModelStore = persistentStore<string>("playground-selected-model", "");
+  const systemPromptStore = persistentStore<string>("playground-system-prompt", "");
+  const temperatureStore = persistentStore<number>("playground-temperature", 0.7);
+
+  function loadMessages(): ChatMessage[] {
+    try {
+      const saved = localStorage.getItem("playground-messages");
+      return saved ? JSON.parse(saved) : [];
+    } catch {
+      return [];
+    }
+  }
+
+  let messages = $state<ChatMessage[]>(loadMessages());
+  let userInput = $state("");
+  let isStreaming = $state(false);
+  let isReasoning = $state(false);
+  let reasoningStartTime = $state<number>(0);
+  let abortController = $state<AbortController | null>(null);
+  let messagesContainer: HTMLDivElement | undefined = $state();
+  let showSettings = $state(false);
+  let attachedImages = $state<string[]>([]);
+  let fileInput = $state<HTMLInputElement | null>(null);
+  let imageError = $state<string | null>(null);
+
+  let hasModels = $derived($models.some((m) => !m.unlisted));
+  let userScrolledUp = $state(false);
+
+  $effect(() => {
+    playgroundStores.chatStreaming.set(isStreaming);
+  });
+
+  function handleMessagesScroll() {
+    if (!messagesContainer) return;
+    const { scrollTop, scrollHeight, clientHeight } = messagesContainer;
+    // Consider "at bottom" if within 40px of the bottom
+    userScrolledUp = scrollHeight - scrollTop - clientHeight > 40;
+  }
+
+  // Auto-scroll when messages change — skip if user scrolled up
+  $effect(() => {
+    if (messages.length > 0 && messagesContainer && !userScrolledUp) {
+      messagesContainer.scrollTo({
+        top: messagesContainer.scrollHeight,
+        behavior: isStreaming ? "instant" : "smooth",
+      });
+    }
+  });
+
+  // Persist messages to localStorage (throttled to once per 2s)
+  let lastSaveTime = 0;
+  $effect(() => {
+    const json = JSON.stringify(messages);
+    const elapsed = Date.now() - lastSaveTime;
+    const save = () => {
+      try { localStorage.setItem("playground-messages", json); } catch {}
+      lastSaveTime = Date.now();
+    };
+    if (elapsed >= 2000) {
+      save();
+      return;
+    }
+    const timer = setTimeout(save, 2000 - elapsed);
+    return () => clearTimeout(timer);
+  });
+
+  async function sendMessage() {
+    const trimmedInput = userInput.trim();
+    if ((!trimmedInput && attachedImages.length === 0) || !$selectedModelStore || isStreaming) return;
+
+    userScrolledUp = false;
+
+    // Build message content (multimodal if images attached)
+    let content: string | ContentPart[];
+    if (attachedImages.length > 0) {
+      const parts: ContentPart[] = [];
+      if (trimmedInput) {
+        parts.push({ type: "text", text: trimmedInput });
+      }
+      for (const url of attachedImages) {
+        parts.push({ type: "image_url", image_url: { url } });
+      }
+      content = parts;
+    } else {
+      content = trimmedInput;
+    }
+
+    // Add user message
+    messages = [...messages, { role: "user", content }];
+    userInput = "";
+    attachedImages = [];
+    imageError = null;
+
+    // Generate response from the new user message
+    await regenerateFromIndex(messages.length - 1);
+  }
+
+  function cancelStreaming() {
+    abortController?.abort();
+  }
+
+  function newChat() {
+    if (isStreaming) {
+      cancelStreaming();
+    }
+    messages = [];
+    isReasoning = false;
+    reasoningStartTime = 0;
+  }
+
+  async function regenerateFromIndex(idx: number) {
+    // Remove all messages after the edited user message
+    messages = messages.slice(0, idx + 1);
+
+    // Add empty assistant message for the new response
+    messages = [...messages, { role: "assistant", content: "" }];
+
+    isStreaming = true;
+    isReasoning = false;
+    reasoningStartTime = 0;
+    abortController = new AbortController();
+
+    try {
+      // Build messages array with optional system prompt
+      const apiMessages: ChatMessage[] = [];
+      if ($systemPromptStore.trim()) {
+        apiMessages.push({ role: "system", content: $systemPromptStore.trim() });
+      }
+      apiMessages.push(...messages.slice(0, -1)); // Add all messages except the empty assistant one
+
+      const stream = streamChatCompletion(
+        $selectedModelStore,
+        apiMessages,
+        abortController.signal,
+        { temperature: $temperatureStore }
+      );
+
+      for await (const chunk of stream) {
+        if (chunk.done) break;
+
+        // Handle reasoning content
+        if (chunk.reasoning_content) {
+          // Start timing on first reasoning content
+          if (!isReasoning) {
+            isReasoning = true;
+            reasoningStartTime = Date.now();
+          }
+
+          // Update the last message with reasoning content
+          messages = messages.map((msg, i) =>
+            i === messages.length - 1
+              ? { ...msg, reasoning_content: (msg.reasoning_content || "") + chunk.reasoning_content }
+              : msg
+          );
+        }
+
+        // Handle regular content - end reasoning phase when we get content
+        if (chunk.content) {
+          if (isReasoning) {
+            // Calculate reasoning time
+            const reasoningTimeMs = Date.now() - reasoningStartTime;
+            isReasoning = false;
+
+            // Update message with reasoning time
+            messages = messages.map((msg, i) =>
+              i === messages.length - 1
+                ? { ...msg, reasoningTimeMs }
+                : msg
+            );
+          }
+
+          // Update the last message (assistant) with new content
+          messages = messages.map((msg, i) =>
+            i === messages.length - 1
+              ? { ...msg, content: msg.content + chunk.content }
+              : msg
+          );
+        }
+      }
+    } catch (error) {
+      if (error instanceof Error && error.name === "AbortError") {
+        // User cancelled, keep partial response
+        // If we were still reasoning, record the time
+        if (isReasoning && reasoningStartTime > 0) {
+          const reasoningTimeMs = Date.now() - reasoningStartTime;
+          messages = messages.map((msg, i) =>
+            i === messages.length - 1
+              ? { ...msg, reasoningTimeMs }
+              : msg
+          );
+        }
+      } else {
+        // Show error in the assistant message
+        const errorMessage = error instanceof Error ? error.message : "An error occurred";
+        messages = messages.map((msg, i) =>
+          i === messages.length - 1
+            ? { ...msg, content: msg.content + `\n\n**Error:** ${errorMessage}` }
+            : msg
+        );
+      }
+    } finally {
+      isStreaming = false;
+      isReasoning = false;
+      abortController = null;
+    }
+  }
+
+  async function editMessage(idx: number, newContent: string) {
+    if (isStreaming || !$selectedModelStore) return;
+
+    // Update the user message at the specified index
+    messages = messages.map((msg, i) =>
+      i === idx ? { ...msg, content: newContent } : msg
+    );
+
+    // Trigger a new chat request with the updated messages
+    await regenerateFromIndex(idx);
+  }
+
+  function handleKeyDown(event: KeyboardEvent) {
+    if (event.key === "Enter" && !event.shiftKey) {
+      event.preventDefault();
+      sendMessage();
+    }
+  }
+
+  const ACCEPTED_IMAGE_FORMATS = ["image/jpeg", "image/png", "image/gif", "image/webp"];
+  const MAX_IMAGE_SIZE = 20 * 1024 * 1024; // 20MB
+  const MAX_IMAGES_PER_MESSAGE = 5;
+
+  function validateImageFile(file: File): string | null {
+    if (!ACCEPTED_IMAGE_FORMATS.includes(file.type)) {
+      return `Invalid file type: ${file.type}. Accepted formats: JPG, PNG, GIF, WEBP`;
+    }
+    if (file.size > MAX_IMAGE_SIZE) {
+      return `File too large: ${(file.size / 1024 / 1024).toFixed(1)}MB. Maximum size: 20MB`;
+    }
+    return null;
+  }
+
+  function fileToDataUrl(file: File): Promise<string> {
+    return new Promise((resolve, reject) => {
+      const reader = new FileReader();
+      reader.onload = () => resolve(reader.result as string);
+      reader.onerror = () => reject(new Error("Failed to read file"));
+      reader.readAsDataURL(file);
+    });
+  }
+
+  async function processImageFiles(files: File[]): Promise<void> {
+    imageError = null;
+
+    if (attachedImages.length + files.length > MAX_IMAGES_PER_MESSAGE) {
+      imageError = `Maximum ${MAX_IMAGES_PER_MESSAGE} images per message`;
+      return;
+    }
+
+    for (const file of files) {
+      const error = validateImageFile(file);
+      if (error) {
+        imageError = error;
+        return;
+      }
+    }
+
+    try {
+      const dataUrls = await Promise.all(files.map(fileToDataUrl));
+      attachedImages = [...attachedImages, ...dataUrls];
+    } catch (error) {
+      imageError = error instanceof Error ? error.message : "Failed to process images";
+    }
+  }
+
+  function handleImageSelect(event: Event) {
+    const input = event.target as HTMLInputElement;
+    if (input.files && input.files.length > 0) {
+      processImageFiles(Array.from(input.files));
+    }
+    // Reset the input so the same file can be selected again
+    input.value = "";
+  }
+
+  function removeImage(idx: number) {
+    attachedImages = attachedImages.filter((_, i) => i !== idx);
+    imageError = null;
+  }
+</script>
+
+<div class="flex flex-col h-full">
+  <!-- Model selector and controls -->
+  <div class="shrink-0 flex flex-wrap gap-2 mb-4">
+    <ModelSelector bind:value={$selectedModelStore} placeholder="Select a model..." disabled={isStreaming} />
+    <div class="flex gap-2">
+      <button
+        class="btn"
+        onclick={() => (showSettings = !showSettings)}
+        title="Settings"
+      >
+        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5">
+          <path fill-rule="evenodd" d="M8.34 1.804A1 1 0 0 1 9.32 1h1.36a1 1 0 0 1 .98.804l.295 1.473c.497.144.971.342 1.416.587l1.25-.834a1 1 0 0 1 1.262.125l.962.962a1 1 0 0 1 .125 1.262l-.834 1.25c.245.445.443.919.587 1.416l1.473.295a1 1 0 0 1 .804.98v1.36a1 1 0 0 1-.804.98l-1.473.295a6.95 6.95 0 0 1-.587 1.416l.834 1.25a1 1 0 0 1-.125 1.262l-.962.962a1 1 0 0 1-1.262.125l-1.25-.834a6.953 6.953 0 0 1-1.416.587l-.295 1.473a1 1 0 0 1-.98.804H9.32a1 1 0 0 1-.98-.804l-.295-1.473a6.957 6.957 0 0 1-1.416-.587l-1.25.834a1 1 0 0 1-1.262-.125l-.962-.962a1 1 0 0 1-.125-1.262l.834-1.25a6.957 6.957 0 0 1-.587-1.416l-1.473-.295A1 1 0 0 1 1 10.68V9.32a1 1 0 0 1 .804-.98l1.473-.295c.144-.497.342-.971.587-1.416l-.834-1.25a1 1 0 0 1 .125-1.262l.962-.962A1 1 0 0 1 5.38 3.03l1.25.834a6.957 6.957 0 0 1 1.416-.587l.294-1.473ZM13 10a3 3 0 1 1-6 0 3 3 0 0 1 6 0Z" clip-rule="evenodd" />
+        </svg>
+      </button>
+      <button class="btn" onclick={newChat} disabled={messages.length === 0 && !isStreaming}>
+        New Chat
+      </button>
+    </div>
+  </div>
+
+  <!-- Settings panel -->
+  {#if showSettings}
+    <div class="shrink-0 mb-4 p-4 bg-surface border border-gray-200 dark:border-white/10 rounded">
+      <div class="mb-4">
+        <label class="block text-sm font-medium mb-1" for="system-prompt">System Prompt</label>
+        <textarea
+          id="system-prompt"
+          class="w-full px-3 py-2 rounded border border-gray-200 dark:border-white/10 bg-card focus:outline-none focus:ring-2 focus:ring-primary resize-none"
+          placeholder="You are a helpful assistant..."
+          rows="3"
+          bind:value={$systemPromptStore}
+          disabled={isStreaming}
+        ></textarea>
+      </div>
+      <div>
+        <label class="block text-sm font-medium mb-1" for="temperature">
+          Temperature: {$temperatureStore.toFixed(2)}
+        </label>
+        <input
+          id="temperature"
+          type="range"
+          min="0"
+          max="2"
+          step="0.05"
+          class="w-full"
+          bind:value={$temperatureStore}
+          disabled={isStreaming}
+        />
+        <div class="flex justify-between text-xs text-txtsecondary mt-1">
+          <span>Precise (0)</span>
+          <span>Creative (2)</span>
+        </div>
+      </div>
+    </div>
+  {/if}
+
+  <!-- Empty state for no models configured -->
+  {#if !hasModels}
+    <div class="flex-1 flex items-center justify-center text-txtsecondary">
+      <p>No models configured. Add models to your configuration to start chatting.</p>
+    </div>
+  {:else}
+    <!-- Messages area -->
+    <div
+      class="flex-1 overflow-y-auto mb-4 px-2"
+      bind:this={messagesContainer}
+      onscroll={handleMessagesScroll}
+    >
+      {#if messages.length === 0}
+        <div class="h-full flex items-center justify-center text-txtsecondary">
+          <p>Start a conversation by typing a message below.</p>
+        </div>
+      {:else}
+        {#each messages as message, idx (idx)}
+          <ChatMessageComponent
+            role={message.role}
+            content={message.content}
+            reasoning_content={message.reasoning_content}
+            reasoningTimeMs={message.reasoningTimeMs}
+            isStreaming={isStreaming && idx === messages.length - 1 && message.role === "assistant"}
+            isReasoning={isReasoning && idx === messages.length - 1 && message.role === "assistant"}
+            onEdit={message.role === "user" ? (newContent) => editMessage(idx, newContent) : undefined}
+            onRegenerate={message.role === "assistant" && idx > 0 && messages[idx - 1].role === "user"
+              ? () => regenerateFromIndex(idx - 1)
+              : undefined}
+          />
+        {/each}
+      {/if}
+    </div>
+
+    <!-- Input area -->
+    <div class="shrink-0">
+      <!-- Image preview strip -->
+      {#if attachedImages.length > 0}
+        <div class="mb-2 flex flex-wrap gap-2">
+          {#each attachedImages as imageUrl, idx (idx)}
+            <div class="relative group">
+              <img
+                src={imageUrl}
+                alt="Attached image {idx + 1}"
+                class="w-20 h-20 object-cover rounded border border-gray-200 dark:border-white/10"
+              />
+              <button
+                class="absolute -top-2 -right-2 bg-red-500 text-white rounded-full w-6 h-6 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity"
+                onclick={() => removeImage(idx)}
+                title="Remove image"
+              >
+                ×
+              </button>
+            </div>
+          {/each}
+        </div>
+      {/if}
+
+      <!-- Error message -->
+      {#if imageError}
+        <div class="mb-2 p-2 bg-red-100 dark:bg-red-900/20 text-red-700 dark:text-red-400 rounded text-sm">
+          {imageError}
+        </div>
+      {/if}
+
+      <div class="flex gap-2">
+        <!-- Hidden file input -->
+        <input
+          type="file"
+          accept=".jpg,.jpeg,.png,.gif,.webp"
+          multiple
+          class="hidden"
+          bind:this={fileInput}
+          onchange={handleImageSelect}
+        />
+
+        <ExpandableTextarea
+          bind:value={userInput}
+          placeholder="Type a message..."
+          rows={3}
+          onkeydown={handleKeyDown}
+          disabled={isStreaming || !$selectedModelStore}
+        />
+        <div class="flex flex-col gap-2">
+          {#if isStreaming}
+            <button class="btn bg-red-500 hover:bg-red-600 text-white" onclick={cancelStreaming}>
+              Cancel
+            </button>
+          {:else}
+            <button
+              class="btn"
+              onclick={() => fileInput?.click()}
+              disabled={isStreaming || !$selectedModelStore}
+              title="Attach image"
+            >
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5">
+                <path fill-rule="evenodd" d="M1 5.25A2.25 2.25 0 0 1 3.25 3h13.5A2.25 2.25 0 0 1 19 5.25v9.5A2.25 2.25 0 0 1 16.75 17H3.25A2.25 2.25 0 0 1 1 14.75v-9.5Zm1.5 5.81v3.69c0 .414.336.75.75.75h13.5a.75.75 0 0 0 .75-.75v-2.69l-2.22-2.219a.75.75 0 0 0-1.06 0l-1.91 1.909.47.47a.75.75 0 1 1-1.06 1.06L6.53 8.091a.75.75 0 0 0-1.06 0l-2.97 2.97ZM12 7a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z" clip-rule="evenodd" />
+              </svg>
+            </button>
+            <button
+              class="btn bg-primary text-btn-primary-text hover:opacity-90"
+              onclick={sendMessage}
+              disabled={(!userInput.trim() && attachedImages.length === 0) || !$selectedModelStore}
+            >
+              Send
+            </button>
+          {/if}
+        </div>
+      </div>
+    </div>
+  {/if}
+</div>

ui-svelte/src/components/playground/ChatMessage.svelte

@@ -0,0 +1,398 @@
+<script lang="ts">
+  import { renderMarkdown, escapeHtml, renderStreamingMarkdown, createStreamingCache } from "../../lib/markdown";
+  import type { RenderedBlock } from "../../lib/markdown";
+  import { Copy, Check, Pencil, X, Save, RefreshCw, ChevronDown, ChevronRight, Brain, Code } from "lucide-svelte";
+  import { getTextContent, getImageUrls } from "../../lib/types";
+  import type { ContentPart } from "../../lib/types";
+
+  interface Props {
+    role: "user" | "assistant" | "system";
+    content: string | ContentPart[];
+    reasoning_content?: string;
+    reasoningTimeMs?: number;
+    isStreaming?: boolean;
+    isReasoning?: boolean;
+    onEdit?: (newContent: string) => void;
+    onRegenerate?: () => void;
+  }
+
+  let { role, content, reasoning_content = "", reasoningTimeMs = 0, isStreaming = false, isReasoning = false, onEdit, onRegenerate }: Props = $props();
+
+  let textContent = $derived(getTextContent(content));
+  let imageUrls = $derived(getImageUrls(content));
+  let hasImages = $derived(imageUrls.length > 0);
+  let canEdit = $derived(onEdit !== undefined && !hasImages);
+
+  let streamingCache = createStreamingCache();
+  let renderedParts = $derived.by(() => {
+    if (role !== "assistant") {
+      return { blocks: [{ id: -1, html: escapeHtml(textContent).replace(/\n/g, '<br>') }] as RenderedBlock[], pendingHtml: "" };
+    }
+    if (!isStreaming) {
+      streamingCache = createStreamingCache();
+      return { blocks: [{ id: -1, html: renderMarkdown(textContent) }] as RenderedBlock[], pendingHtml: "" };
+    }
+    return renderStreamingMarkdown(textContent, streamingCache);
+  });
+  let copied = $state(false);
+  let showRaw = $state(false);
+  let isEditing = $state(false);
+  let editContent = $state("");
+  let showReasoning = $state(false);
+  let modalImageUrl = $state<string | null>(null);
+
+  function formatDuration(ms: number): string {
+    if (ms < 1000) {
+      return `${ms.toFixed(0)}ms`;
+    }
+    return `${(ms / 1000).toFixed(1)}s`;
+  }
+
+  async function copyToClipboard() {
+    try {
+      if (navigator.clipboard && window.isSecureContext) {
+        await navigator.clipboard.writeText(textContent);
+      } else {
+        // Fallback for non-secure contexts (HTTP)
+        const textarea = document.createElement("textarea");
+        textarea.value = textContent;
+        textarea.style.position = "fixed";
+        textarea.style.left = "-9999px";
+        document.body.appendChild(textarea);
+        textarea.select();
+        document.execCommand("copy");
+        document.body.removeChild(textarea);
+      }
+      copied = true;
+      setTimeout(() => (copied = false), 2000);
+    } catch (err) {
+      console.error("Failed to copy:", err);
+    }
+  }
+
+  function startEdit() {
+    editContent = textContent;
+    isEditing = true;
+  }
+
+  function cancelEdit() {
+    isEditing = false;
+    editContent = "";
+  }
+
+  function saveEdit() {
+    if (onEdit && editContent.trim() !== textContent) {
+      onEdit(editContent.trim());
+    }
+    isEditing = false;
+    editContent = "";
+  }
+
+  function openModal(imageUrl: string) {
+    modalImageUrl = imageUrl;
+    document.body.style.overflow = "hidden";
+  }
+
+  function closeModal(event?: MouseEvent) {
+    // Only close if clicking the background, not the image
+    if (event && event.target !== event.currentTarget) {
+      return;
+    }
+    modalImageUrl = null;
+    document.body.style.overflow = "";
+  }
+
+  function handleModalKeyDown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      closeModal();
+    }
+  }
+
+  function handleKeyDown(event: KeyboardEvent) {
+    if (event.key === "Enter" && !event.shiftKey) {
+      event.preventDefault();
+      saveEdit();
+    } else if (event.key === "Escape") {
+      cancelEdit();
+    }
+  }
+</script>
+
+<div class="flex {role === 'user' ? 'justify-end' : 'justify-start'} mb-4">
+  <div
+    class="relative group rounded-lg px-4 py-2 {role === 'user'
+      ? 'max-w-[85%] bg-primary text-btn-primary-text'
+      : 'w-full sm:w-4/5 bg-surface border border-gray-200 dark:border-white/10'}"
+  >
+    {#if role === "assistant"}
+      {#if reasoning_content || isReasoning}
+        <div class="mb-3 border border-gray-200 dark:border-white/10 rounded overflow-hidden">
+          <button
+            class="w-full flex items-center gap-2 px-3 py-2 bg-gray-50 dark:bg-white/5 hover:bg-gray-100 dark:hover:bg-white/10 transition-colors text-sm"
+            onclick={() => showReasoning = !showReasoning}
+          >
+            {#if showReasoning}
+              <ChevronDown class="w-4 h-4" />
+            {:else}
+              <ChevronRight class="w-4 h-4" />
+            {/if}
+            <Brain class="w-4 h-4" />
+            <span class="font-medium">Reasoning</span>
+            <span class="text-txtsecondary ml-2">
+              ({reasoning_content.length} chars{#if !isReasoning && reasoningTimeMs > 0}, {formatDuration(reasoningTimeMs)}{/if})
+            </span>
+            {#if isReasoning}
+              <span class="ml-auto flex items-center gap-1 text-txtsecondary">
+                <span class="w-1.5 h-1.5 bg-primary rounded-full animate-pulse"></span>
+                reasoning...
+              </span>
+            {/if}
+          </button>
+          {#if showReasoning}
+            <div class="px-3 py-2 bg-gray-50/50 dark:bg-white/[0.02] text-sm text-txtsecondary whitespace-pre-wrap font-mono">
+              {reasoning_content}{#if isReasoning}<span class="inline-block w-1.5 h-4 bg-current animate-pulse ml-0.5"></span>{/if}
+            </div>
+          {/if}
+        </div>
+      {/if}
+      {#if hasImages}
+        <div class="mb-3 flex flex-wrap gap-2">
+          {#each imageUrls as imageUrl, idx (idx)}
+            <button
+              onclick={() => openModal(imageUrl)}
+              class="cursor-pointer rounded border border-gray-200 dark:border-white/10 hover:opacity-80 transition-opacity"
+            >
+              <img
+                src={imageUrl}
+                alt="Image {idx + 1}"
+                class="max-h-64 rounded"
+              />
+            </button>
+          {/each}
+        </div>
+      {/if}
+      {#if showRaw}
+        <div class="whitespace-pre-wrap font-mono text-sm">{textContent}</div>
+      {:else}
+        <div class="prose prose-sm dark:prose-invert max-w-none">
+          {#each renderedParts.blocks as block (block.id)}
+            {@html block.html}
+          {/each}
+          {@html renderedParts.pendingHtml}
+          {#if isStreaming && !isReasoning}
+            <span class="inline-block w-2 h-4 bg-current animate-pulse ml-0.5"></span>
+          {/if}
+        </div>
+      {/if}
+      {#if !isStreaming}
+        <div class="flex gap-1 mt-2 pt-1 border-t border-gray-200 dark:border-white/10">
+          {#if onRegenerate}
+            <button
+              class="p-1 rounded hover:bg-black/10 dark:hover:bg-white/10 text-txtsecondary"
+              onclick={onRegenerate}
+              title="Regenerate response"
+            >
+              <RefreshCw class="w-4 h-4" />
+            </button>
+          {/if}
+          <button
+            class="p-1 rounded hover:bg-black/10 dark:hover:bg-white/10 text-txtsecondary"
+            onclick={copyToClipboard}
+            title={copied ? "Copied!" : "Copy to clipboard"}
+          >
+            {#if copied}
+              <Check class="w-4 h-4 text-green-500" />
+            {:else}
+              <Copy class="w-4 h-4" />
+            {/if}
+          </button>
+          <button
+            class="p-1 rounded hover:bg-black/10 dark:hover:bg-white/10 {showRaw ? 'text-primary' : 'text-txtsecondary'}"
+            onclick={() => showRaw = !showRaw}
+            title={showRaw ? "Show rendered" : "Show raw"}
+          >
+            <Code class="w-4 h-4" />
+          </button>
+        </div>
+      {/if}
+    {:else}
+      {#if isEditing}
+        <div class="flex flex-col gap-2 min-w-[300px]">
+          <textarea
+            class="w-full px-3 py-2 rounded border border-gray-200 dark:border-white/10 bg-surface text-txtmain focus:outline-none focus:ring-2 focus:ring-primary resize-none"
+            rows="3"
+            bind:value={editContent}
+            onkeydown={handleKeyDown}
+          ></textarea>
+          <div class="flex justify-end gap-2">
+            <button
+              class="p-1.5 rounded hover:bg-white/20"
+              onclick={cancelEdit}
+              title="Cancel"
+            >
+              <X class="w-4 h-4" />
+            </button>
+            <button
+              class="p-1.5 rounded hover:bg-white/20"
+              onclick={saveEdit}
+              title="Save"
+            >
+              <Save class="w-4 h-4" />
+            </button>
+          </div>
+        </div>
+      {:else}
+        {#if hasImages}
+          <div class="mb-2 flex flex-wrap gap-2">
+            {#each imageUrls as imageUrl, idx (idx)}
+              <button
+                onclick={() => openModal(imageUrl)}
+                class="cursor-pointer rounded border border-white/20 hover:opacity-80 transition-opacity"
+              >
+                <img
+                  src={imageUrl}
+                  alt="Image {idx + 1}"
+                  class="max-w-[200px] rounded"
+                />
+              </button>
+            {/each}
+          </div>
+        {/if}
+        <div class="whitespace-pre-wrap pr-8">{textContent}</div>
+        {#if canEdit}
+          <button
+            class="absolute top-2 right-2 p-1.5 rounded-lg opacity-0 group-hover:opacity-100 transition-opacity bg-white/20 hover:bg-white/30 shadow-sm"
+            onclick={startEdit}
+            title="Edit message"
+          >
+            <Pencil class="w-4 h-4" />
+          </button>
+        {/if}
+      {/if}
+    {/if}
+  </div>
+</div>
+
+<!-- Full-size image modal -->
+{#if modalImageUrl}
+  <div
+    class="fixed inset-0 z-50 flex items-center justify-center bg-black/80 p-4"
+    onclick={(e) => closeModal(e)}
+    onkeydown={handleModalKeyDown}
+    role="button"
+    tabindex="-1"
+  >
+    <button
+      class="absolute top-4 right-4 p-2 rounded-lg bg-white/10 hover:bg-white/20 text-white transition-colors"
+      onclick={() => closeModal()}
+      title="Close"
+    >
+      <X class="w-6 h-6" />
+    </button>
+    <img
+      src={modalImageUrl}
+      alt=""
+      class="max-w-full max-h-full rounded pointer-events-none"
+    />
+  </div>
+{/if}
+
+<style>
+  .prose :global(pre) {
+    background-color: var(--color-surface);
+    border: 1px solid var(--color-border, rgba(128, 128, 128, 0.2));
+    border-radius: 0.375rem;
+    padding: 0.75rem;
+    overflow-x: auto;
+    margin: 0.5rem 0;
+  }
+
+  .prose :global(code) {
+    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+    font-size: 0.875em;
+  }
+
+  .prose :global(pre code) {
+    background: none;
+    padding: 0;
+  }
+
+  .prose :global(code:not(pre code)) {
+    background-color: var(--color-surface);
+    padding: 0.125rem 0.25rem;
+    border-radius: 0.25rem;
+    border: 1px solid var(--color-border, rgba(128, 128, 128, 0.2));
+  }
+
+  .prose :global(p) {
+    margin: 0.5rem 0;
+  }
+
+  .prose :global(p:first-child) {
+    margin-top: 0;
+  }
+
+  .prose :global(p:last-child) {
+    margin-bottom: 0;
+  }
+
+  .prose :global(ul),
+  .prose :global(ol) {
+    margin: 0.5rem 0;
+    padding-left: 1.5rem;
+  }
+
+  .prose :global(li) {
+    margin: 0.25rem 0;
+  }
+
+  .prose :global(h1),
+  .prose :global(h2),
+  .prose :global(h3),
+  .prose :global(h4) {
+    margin: 1rem 0 0.5rem 0;
+    font-weight: 600;
+  }
+
+  .prose :global(h1:first-child),
+  .prose :global(h2:first-child),
+  .prose :global(h3:first-child),
+  .prose :global(h4:first-child) {
+    margin-top: 0;
+  }
+
+  .prose :global(blockquote) {
+    border-left: 3px solid var(--color-primary);
+    padding-left: 1rem;
+    margin: 0.5rem 0;
+    font-style: italic;
+  }
+
+  .prose :global(a) {
+    color: var(--color-primary);
+    text-decoration: underline;
+  }
+
+  .prose :global(table) {
+    width: 100%;
+    border-collapse: collapse;
+    margin: 0.5rem 0;
+  }
+
+  .prose :global(th),
+  .prose :global(td) {
+    border: 1px solid var(--color-border, rgba(128, 128, 128, 0.2));
+    padding: 0.5rem;
+    text-align: left;
+  }
+
+  .prose :global(th) {
+    background-color: var(--color-surface);
+    font-weight: 600;
+  }
+
+  /* Highlight.js theme overrides for dark mode */
+  :global(.dark) .prose :global(.hljs) {
+    background: transparent;
+  }
+</style>

ui-svelte/src/components/playground/ExpandableTextarea.svelte

@@ -0,0 +1,121 @@
+<script lang="ts">
+  import { untrack } from "svelte";
+  import { Maximize2, X } from "lucide-svelte";
+
+  interface Props {
+    value: string;
+    placeholder?: string;
+    rows?: number;
+    disabled?: boolean;
+    onkeydown?: (event: KeyboardEvent) => void;
+  }
+
+  let {
+    value = $bindable(),
+    placeholder = "",
+    rows = 3,
+    disabled = false,
+    onkeydown,
+  }: Props = $props();
+
+  let isExpanded = $state(false);
+  let expandedValue = $state("");
+  let expandedTextarea: HTMLTextAreaElement | undefined = $state();
+
+  function openExpanded() {
+    expandedValue = value;
+    isExpanded = true;
+  }
+
+  function closeExpanded() {
+    isExpanded = false;
+  }
+
+  function saveExpanded() {
+    value = expandedValue;
+    isExpanded = false;
+  }
+
+  function handleKeyDown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      closeExpanded();
+    }
+  }
+
+  // Focus the textarea when expanded view opens
+  $effect(() => {
+    if (isExpanded && expandedTextarea) {
+      expandedTextarea.focus();
+      const len = untrack(() => expandedValue.length);
+      expandedTextarea.setSelectionRange(len, len);
+    }
+  });
+</script>
+
+<div class="flex-1 relative group flex items-stretch min-h-0">
+  <textarea
+    class="w-full px-3 py-2 pr-10 rounded border border-gray-200 dark:border-white/10 bg-surface focus:outline-none focus:ring-2 focus:ring-inset focus:ring-primary resize-none"
+    {placeholder}
+    {rows}
+    bind:value
+    {onkeydown}
+    {disabled}
+  ></textarea>
+  <button
+    class="absolute top-2 right-2 p-1.5 rounded-lg opacity-60 md:opacity-0 group-hover:opacity-100 transition-opacity bg-surface/90 hover:bg-surface border border-gray-200 dark:border-white/10 shadow-sm"
+    onclick={openExpanded}
+    title="Expand to edit"
+    type="button"
+    {disabled}
+  >
+    <Maximize2 class="w-4 h-4" />
+  </button>
+</div>
+
+{#if isExpanded}
+  <div class="fixed inset-0 z-50 flex items-center justify-center bg-black/50 p-4">
+    <div class="w-full max-w-4xl h-[80vh] flex flex-col bg-surface rounded-lg shadow-xl border border-gray-200 dark:border-white/10">
+      <!-- Header -->
+      <div class="flex justify-between items-center p-4 border-b border-gray-200 dark:border-white/10">
+        <h3 class="font-medium">Edit Text</h3>
+        <button
+          class="p-1.5 rounded-lg hover:bg-gray-100 dark:hover:bg-white/10"
+          onclick={closeExpanded}
+          title="Close"
+          type="button"
+        >
+          <X class="w-5 h-5" />
+        </button>
+      </div>
+
+      <!-- Textarea -->
+      <div class="flex-1 p-4">
+        <textarea
+          bind:this={expandedTextarea}
+          class="w-full h-full px-4 py-3 rounded border border-gray-200 dark:border-white/10 bg-card focus:outline-none focus:ring-2 focus:ring-primary resize-none"
+          placeholder={placeholder}
+          bind:value={expandedValue}
+          onkeydown={handleKeyDown}
+        ></textarea>
+      </div>
+
+      <!-- Footer -->
+      <div class="flex justify-end gap-2 p-4 border-t border-gray-200 dark:border-white/10">
+        <button
+          class="btn"
+          onclick={closeExpanded}
+          type="button"
+        >
+          Cancel
+        </button>
+        <button
+          class="btn bg-primary text-btn-primary-text hover:opacity-90"
+          onclick={saveExpanded}
+          type="button"
+        >
+          Done
+        </button>
+      </div>
+    </div>
+  </div>
+{/if}

ui-svelte/src/components/playground/ImageInterface.svelte

@@ -0,0 +1,234 @@
+<script lang="ts">
+  import { models } from "../../stores/api";
+  import { persistentStore } from "../../stores/persistent";
+  import { generateImage } from "../../lib/imageApi";
+  import { playgroundStores } from "../../stores/playgroundActivity";
+  import ModelSelector from "./ModelSelector.svelte";
+  import ExpandableTextarea from "./ExpandableTextarea.svelte";
+
+  const selectedModelStore = persistentStore<string>("playground-image-model", "");
+  const selectedSizeStore = persistentStore<string>("playground-image-size", "1024x1024");
+
+  let prompt = $state("");
+  let isGenerating = $state(false);
+  let generatedImage = $state<string | null>(null);
+  let error = $state<string | null>(null);
+  let abortController = $state<AbortController | null>(null);
+  let showFullscreen = $state(false);
+
+  let hasModels = $derived($models.some((m) => !m.unlisted));
+
+  $effect(() => {
+    playgroundStores.imageGenerating.set(isGenerating);
+  });
+
+  async function generate() {
+    const trimmedPrompt = prompt.trim();
+    if (!trimmedPrompt || !$selectedModelStore || isGenerating) return;
+
+    isGenerating = true;
+    error = null;
+    abortController = new AbortController();
+
+    try {
+      const response = await generateImage(
+        $selectedModelStore,
+        trimmedPrompt,
+        $selectedSizeStore,
+        abortController.signal
+      );
+
+      if (response.data && response.data.length > 0) {
+        const imageData = response.data[0];
+        if (imageData.b64_json) {
+          generatedImage = `data:image/png;base64,${imageData.b64_json}`;
+        } else if (imageData.url) {
+          generatedImage = imageData.url;
+        }
+      }
+    } catch (err) {
+      if (err instanceof Error && err.name === "AbortError") {
+        // User cancelled
+      } else {
+        error = err instanceof Error ? err.message : "An error occurred";
+      }
+    } finally {
+      isGenerating = false;
+      abortController = null;
+    }
+  }
+
+  function cancelGeneration() {
+    abortController?.abort();
+  }
+
+  function clearImage() {
+    generatedImage = null;
+    error = null;
+    prompt = "";
+  }
+
+  function downloadImage() {
+    if (!generatedImage) return;
+
+    const link = document.createElement("a");
+    link.href = generatedImage;
+    link.download = `generated-image-${Date.now()}.png`;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+  }
+
+  function openFullscreen() {
+    showFullscreen = true;
+  }
+
+  function closeFullscreen(event?: MouseEvent) {
+    // Only close if clicking the background, not the image
+    if (event && event.target !== event.currentTarget) {
+      return;
+    }
+    showFullscreen = false;
+  }
+
+  function handleKeyDown(event: KeyboardEvent) {
+    if (event.key === "Enter" && !event.shiftKey) {
+      event.preventDefault();
+      generate();
+    }
+  }
+</script>
+
+<div class="flex flex-col h-full">
+  <!-- Model selector -->
+  <div class="shrink-0 flex flex-wrap gap-2 mb-4">
+    <ModelSelector bind:value={$selectedModelStore} placeholder="Select an image model..." disabled={isGenerating} />
+    <select
+      class="px-3 py-2 rounded border border-gray-200 dark:border-white/10 bg-surface focus:outline-none focus:ring-2 focus:ring-primary"
+      bind:value={$selectedSizeStore}
+      disabled={isGenerating}
+    >
+      <optgroup label="Square">
+        <option value="512x512">512x512</option>
+        <option value="1024x1024">1024x1024</option>
+      </optgroup>
+      <optgroup label="Landscape">
+        <option value="1024x768">1024x768 (4:3)</option>
+        <option value="1280x720">1280x720 (16:9)</option>
+        <option value="1792x1024">1792x1024 (SDXL)</option>
+      </optgroup>
+      <optgroup label="Portrait">
+        <option value="768x1024">768x1024 (3:4)</option>
+        <option value="720x1280">720x1280 (9:16)</option>
+        <option value="1024x1792">1024x1792 (SDXL)</option>
+      </optgroup>
+    </select>
+  </div>
+
+  <!-- Empty state for no models configured -->
+  {#if !hasModels}
+    <div class="flex-1 flex items-center justify-center text-txtsecondary">
+      <p>No models configured. Add models to your configuration to generate images.</p>
+    </div>
+  {:else}
+    <!-- Image display area -->
+    <div class="flex-1 overflow-auto mb-4 flex items-center justify-center bg-surface border border-gray-200 dark:border-white/10 rounded">
+      {#if isGenerating}
+        <div class="text-center text-txtsecondary">
+          <div class="inline-block w-8 h-8 border-4 border-primary border-t-transparent rounded-full animate-spin mb-2"></div>
+          <p>Generating image...</p>
+        </div>
+      {:else if error}
+        <div class="text-center text-red-500 p-4">
+          <p class="font-medium">Error</p>
+          <p class="text-sm mt-1">{error}</p>
+        </div>
+      {:else if generatedImage}
+        <div class="relative max-w-full max-h-full flex items-center justify-center">
+          <button
+            class="p-0 border-0 bg-transparent cursor-pointer"
+            onclick={openFullscreen}
+            aria-label="View fullscreen"
+          >
+            <img
+              src={generatedImage}
+              alt="AI generated content"
+              class="max-w-full max-h-full object-contain hover:opacity-90 transition-opacity"
+            />
+          </button>
+          <button
+            class="absolute bottom-2 right-2 p-2 bg-black/60 hover:bg-black/80 text-white rounded-full transition-colors"
+            onclick={(e) => { e.stopPropagation(); downloadImage(); }}
+            aria-label="Download image"
+          >
+            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
+            </svg>
+          </button>
+        </div>
+      {:else}
+        <div class="text-center text-txtsecondary">
+          <p>Enter a prompt below to generate an image</p>
+        </div>
+      {/if}
+    </div>
+
+    <!-- Prompt input area -->
+    <div class="shrink-0 flex flex-col md:flex-row gap-2">
+      <ExpandableTextarea
+        bind:value={prompt}
+        placeholder="Describe the image you want to generate..."
+        rows={3}
+        onkeydown={handleKeyDown}
+        disabled={isGenerating || !$selectedModelStore}
+      />
+      <div class="flex flex-row md:flex-col gap-2">
+        {#if isGenerating}
+          <button class="btn bg-red-500 hover:bg-red-600 text-white flex-1 md:flex-none" onclick={cancelGeneration}>
+            Cancel
+          </button>
+        {:else}
+          <button
+            class="btn bg-primary text-btn-primary-text hover:opacity-90 flex-1 md:flex-none"
+            onclick={generate}
+            disabled={!prompt.trim() || !$selectedModelStore}
+          >
+            Generate
+          </button>
+          <button
+            class="btn flex-1 md:flex-none"
+            onclick={clearImage}
+            disabled={!generatedImage && !error && !prompt.trim()}
+          >
+            Clear
+          </button>
+        {/if}
+      </div>
+    </div>
+  {/if}
+</div>
+
+<!-- Fullscreen dialog -->
+{#if showFullscreen && generatedImage}
+  <div
+    class="fixed inset-0 bg-black/90 z-50 flex items-center justify-center p-4"
+    onclick={(e) => closeFullscreen(e)}
+    onkeydown={(e) => e.key === 'Escape' && closeFullscreen()}
+    role="dialog"
+    aria-modal="true"
+    tabindex="-1"
+  >
+    <button
+      class="absolute top-4 right-4 text-white hover:text-gray-300 text-2xl w-10 h-10 flex items-center justify-center rounded-full hover:bg-white/10 transition-colors"
+      onclick={() => closeFullscreen()}
+      aria-label="Close fullscreen"
+    >
+      ×
+    </button>
+    <img
+      src={generatedImage}
+      alt="AI generated content"
+      class="max-w-full max-h-full object-contain pointer-events-none"
+    />
+  </div>
+{/if}

ui-svelte/src/components/playground/ModelSelector.svelte

@@ -0,0 +1,39 @@
+<script lang="ts">
+  import { models } from "../../stores/api";
+  import { groupModels } from "../../lib/modelUtils";
+
+  interface Props {
+    value: string;
+    placeholder?: string;
+    disabled?: boolean;
+  }
+
+  let { value = $bindable(), placeholder = "Select a model...", disabled = false }: Props = $props();
+
+  let grouped = $derived(groupModels($models));
+  let hasModels = $derived(grouped.local.length > 0 || Object.keys(grouped.peersByProvider).length > 0);
+</script>
+
+{#if hasModels}
+  <select
+    class="min-w-0 flex-1 basis-48 px-3 py-2 rounded border border-gray-200 dark:border-white/10 bg-surface focus:outline-none focus:ring-2 focus:ring-primary"
+    bind:value
+    {disabled}
+  >
+    <option value="">{placeholder}</option>
+    {#if grouped.local.length > 0}
+      <optgroup label="Local">
+        {#each grouped.local as model (model.id)}
+          <option value={model.id}>{model.id}</option>
+        {/each}
+      </optgroup>
+    {/if}
+    {#each Object.entries(grouped.peersByProvider).sort(([a], [b]) => a.localeCompare(b)) as [peerId, peerModels] (peerId)}
+      <optgroup label="Peer: {peerId}">
+        {#each peerModels as model (model.id)}
+          <option value={model.id}>{model.id}</option>
+        {/each}
+      </optgroup>
+    {/each}
+  </select>
+{/if}

ui-svelte/src/components/playground/PlaceholderTab.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+  interface Props {
+    featureName: string;
+  }
+
+  let { featureName }: Props = $props();
+</script>
+
+<div class="flex items-center justify-center h-full">
+  <div class="text-center text-txtsecondary">
+    <p class="text-lg">{featureName}</p>
+    <p class="text-sm mt-2">To be implemented</p>
+  </div>
+</div>

ui-svelte/src/components/playground/SpeechInterface.svelte

@@ -0,0 +1,360 @@
+<script lang="ts">
+  import { models } from "../../stores/api";
+  import { persistentStore } from "../../stores/persistent";
+  import { generateSpeech } from "../../lib/speechApi";
+  import { playgroundStores } from "../../stores/playgroundActivity";
+  import ModelSelector from "./ModelSelector.svelte";
+  import ExpandableTextarea from "./ExpandableTextarea.svelte";
+
+  const selectedModelStore = persistentStore<string>("playground-speech-model", "");
+  const selectedVoiceStore = persistentStore<string>("playground-speech-voice", "coral");
+  const autoPlayStore = persistentStore<boolean>("playground-speech-autoplay", false);
+
+  let inputText = $state("");
+  let isGenerating = $state(false);
+  let generatedAudioUrl = $state<string | null>(null);
+  let generatedVoice = $state<string | null>(null);
+  let generatedTimestamp = $state<Date | null>(null);
+  let error = $state<string | null>(null);
+  let abortController = $state<AbortController | null>(null);
+  let audioElement = $state<HTMLAudioElement | null>(null);
+  let availableVoices = $state<string[]>(["coral", "alloy", "echo", "fable", "onyx", "nova", "shimmer"]);
+  let isLoadingVoices = $state(false);
+
+  const defaultVoices = ["coral", "alloy", "echo", "fable", "onyx", "nova", "shimmer"];
+  const CACHE_KEY = "playground-speech-voices-cache";
+
+  function getVoicesCache(): Record<string, string[]> {
+    if (typeof window === "undefined") return {};
+    try {
+      const saved = localStorage.getItem(CACHE_KEY);
+      return saved ? JSON.parse(saved) : {};
+    } catch {
+      return {};
+    }
+  }
+
+  function saveVoicesCache(cache: Record<string, string[]>) {
+    if (typeof window === "undefined") return;
+    try {
+      localStorage.setItem(CACHE_KEY, JSON.stringify(cache));
+    } catch (e) {
+      console.error("Error saving voices cache", e);
+    }
+  }
+
+  let hasModels = $derived($models.some((m) => !m.unlisted));
+
+  let isInitialLoad = $state(true);
+
+  $effect(() => {
+    playgroundStores.speechGenerating.set(isGenerating);
+  });
+
+  // On page load, restore cached voices for the selected model if available
+  $effect(() => {
+    const model = $selectedModelStore;
+
+    if (isInitialLoad) {
+      isInitialLoad = false;
+      // If we have cached voices for this model, use them
+      const cache = getVoicesCache();
+      if (model && cache[model]) {
+        availableVoices = cache[model];
+      }
+    }
+  });
+
+  async function refreshVoices() {
+    const model = $selectedModelStore;
+    if (!model || isLoadingVoices) return;
+
+    isLoadingVoices = true;
+
+    try {
+      const response = await fetch(`/v1/audio/voices?model=${encodeURIComponent(model)}`);
+      if (!response.ok) {
+        // Fall back to default voices if API call fails
+        availableVoices = defaultVoices;
+        const cache = getVoicesCache();
+        cache[model] = defaultVoices;
+        saveVoicesCache(cache);
+        selectedVoiceStore.set(defaultVoices[0]);
+        return;
+      }
+      const data = await response.json();
+      // Expect response to be an array of voice strings or an object with a voices array
+      const voices = Array.isArray(data) ? data : (data.voices || defaultVoices);
+      const newVoices = voices.length > 0 ? voices : defaultVoices;
+
+      availableVoices = newVoices;
+      const cache = getVoicesCache();
+      cache[model] = newVoices;
+      saveVoicesCache(cache);
+
+      // Reset to first available voice
+      selectedVoiceStore.set(newVoices[0]);
+    } catch {
+      // Fall back to default voices on error
+      availableVoices = defaultVoices;
+      const cache = getVoicesCache();
+      cache[model] = defaultVoices;
+      saveVoicesCache(cache);
+      selectedVoiceStore.set(defaultVoices[0]);
+    } finally {
+      isLoadingVoices = false;
+    }
+  }
+
+  function handleVoiceChange(event: Event) {
+    const value = (event.target as HTMLSelectElement).value;
+    if (value === "(refresh)") {
+      refreshVoices();
+    } else {
+      selectedVoiceStore.set(value);
+    }
+  }
+
+  // Auto-play effect when new audio is generated
+  $effect(() => {
+    if (generatedAudioUrl && $autoPlayStore && audioElement) {
+      audioElement.load();
+      audioElement.play().catch(() => {
+        // Ignore auto-play errors (e.g., browser policy blocks)
+      });
+    }
+  });
+
+  async function generate() {
+    const trimmedText = inputText.trim();
+    if (!trimmedText || !$selectedModelStore || isGenerating) return;
+
+    isGenerating = true;
+    error = null;
+    abortController = new AbortController();
+
+    try {
+      const audioBlob = await generateSpeech(
+        $selectedModelStore,
+        trimmedText,
+        $selectedVoiceStore,
+        abortController.signal
+      );
+
+      // Revoke previous URL to prevent memory leaks
+      if (generatedAudioUrl) {
+        URL.revokeObjectURL(generatedAudioUrl);
+      }
+
+      // Create object URL for the audio blob and store metadata
+      generatedAudioUrl = URL.createObjectURL(audioBlob);
+      generatedVoice = $selectedVoiceStore;
+      generatedTimestamp = new Date();
+    } catch (err) {
+      if (err instanceof Error && err.name === "AbortError") {
+        // User cancelled
+      } else {
+        error = err instanceof Error ? err.message : "An error occurred";
+      }
+    } finally {
+      isGenerating = false;
+      abortController = null;
+    }
+  }
+
+  function cancelGeneration() {
+    abortController?.abort();
+  }
+
+  function clearInput() {
+    inputText = "";
+  }
+
+  function downloadAudio() {
+    if (!generatedAudioUrl) return;
+
+    const timestamp = (generatedTimestamp || new Date()).toISOString().replace(/[:.]/g, '-').slice(0, -5);
+    const voice = generatedVoice || 'speech';
+    const filename = `${voice}-${timestamp}.mp3`;
+
+    const a = document.createElement('a');
+    a.href = generatedAudioUrl;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+  }
+
+  function formatTimestamp(date: Date): string {
+    return date.toLocaleString(undefined, {
+      month: 'short',
+      day: 'numeric',
+      hour: 'numeric',
+      minute: '2-digit',
+      hour12: true
+    });
+  }
+
+  function handleKeyDown(event: KeyboardEvent) {
+    if (event.key === "Enter" && !event.shiftKey) {
+      event.preventDefault();
+      generate();
+    }
+  }
+</script>
+
+<div class="flex flex-col h-full">
+  <!-- Model and voice selectors -->
+  <div class="shrink-0 flex gap-2 mb-4">
+    <ModelSelector bind:value={$selectedModelStore} placeholder="Select a speech model..." disabled={isGenerating} />
+    <div class="flex gap-2">
+      <select
+        class="shrink-0 px-3 py-2 rounded border border-gray-200 dark:border-white/10 bg-surface focus:outline-none focus:ring-2 focus:ring-primary"
+        value={$selectedVoiceStore}
+        onchange={handleVoiceChange}
+        disabled={isGenerating || isLoadingVoices || !$selectedModelStore}
+      >
+        {#each availableVoices as voice (voice)}
+          <option value={voice}>{voice}</option>
+        {/each}
+        <option value="(refresh)">(refresh)</option>
+      </select>
+      {#if $selectedModelStore && !getVoicesCache()[$selectedModelStore]}
+        <button
+          class="btn shrink-0"
+          onclick={refreshVoices}
+          disabled={isLoadingVoices}
+          title={isLoadingVoices ? "Loading voices..." : "Load voices for this model"}
+        >
+          {#if isLoadingVoices}
+            <svg class="w-5 h-5 animate-spin" fill="none" viewBox="0 0 24 24">
+              <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+              <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+            </svg>
+          {:else}
+            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"></path>
+            </svg>
+          {/if}
+        </button>
+      {/if}
+    </div>
+  </div>
+
+  <!-- Empty state for no models configured -->
+  {#if !hasModels}
+    <div class="flex-1 flex items-center justify-center text-txtsecondary">
+      <p>No models configured. Add models to your configuration to generate speech.</p>
+    </div>
+  {:else}
+    <!-- Audio display area -->
+    <div class="shrink-0 mb-4 bg-surface border border-gray-200 dark:border-white/10 rounded p-4 md:p-6">
+      {#if isGenerating}
+        <div class="flex items-center justify-center text-txtsecondary py-8">
+          <div class="text-center">
+            <div class="inline-block w-8 h-8 border-4 border-primary border-t-transparent rounded-full animate-spin mb-2"></div>
+            <p>Generating speech...</p>
+          </div>
+        </div>
+      {:else if error}
+        <div class="flex items-center justify-center py-8">
+          <div class="text-center text-red-500">
+            <p class="font-medium">Error</p>
+            <p class="text-sm mt-1">{error}</p>
+          </div>
+        </div>
+      {:else if generatedAudioUrl}
+        <div class="flex flex-col gap-4">
+          <!-- Header with metadata and download -->
+          <div class="flex items-center justify-between gap-4">
+            <div class="flex flex-wrap gap-3 text-sm text-txtsecondary">
+              {#if generatedVoice}
+                <span class="flex items-center gap-1">
+                  <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11a7 7 0 01-7 7m0 0a7 7 0 01-7-7m7 7v4m0 0H8m4 0h4m-4-8a3 3 0 01-3-3V5a3 3 0 116 0v6a3 3 0 01-3 3z"></path>
+                  </svg>
+                  {generatedVoice}
+                </span>
+              {/if}
+              {#if generatedTimestamp}
+                <span class="flex items-center gap-1">
+                  <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"></path>
+                  </svg>
+                  {formatTimestamp(generatedTimestamp)}
+                </span>
+              {/if}
+            </div>
+            <button
+              class="btn shrink-0"
+              onclick={downloadAudio}
+              title="Download audio file"
+            >
+              <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
+              </svg>
+            </button>
+          </div>
+
+          <!-- Audio player with larger controls -->
+          <div class="w-full">
+            <audio bind:this={audioElement} controls class="w-full h-12 md:h-16">
+              <source src={generatedAudioUrl} type="audio/mpeg" />
+              Your browser does not support the audio element.
+            </audio>
+          </div>
+        </div>
+      {:else}
+        <div class="flex items-center justify-center text-txtsecondary py-8">
+          <div class="text-center">
+            <svg class="w-12 h-12 md:w-16 md:h-16 mx-auto mb-2 opacity-40" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11a7 7 0 01-7 7m0 0a7 7 0 01-7-7m7 7v4m0 0H8m4 0h4m-4-8a3 3 0 01-3-3V5a3 3 0 116 0v6a3 3 0 01-3 3z"></path>
+            </svg>
+            <p>Enter text below to convert to speech</p>
+          </div>
+        </div>
+      {/if}
+    </div>
+
+    <!-- Text input area -->
+    <div class="flex-1 flex flex-col md:flex-row gap-2 min-h-0">
+      <ExpandableTextarea
+        bind:value={inputText}
+        placeholder="Enter text to convert to speech..."
+        rows={8}
+        onkeydown={handleKeyDown}
+        disabled={isGenerating || !$selectedModelStore}
+      />
+      <div class="shrink-0 flex md:flex-col gap-2">
+        {#if isGenerating}
+          <button class="btn bg-red-500 hover:bg-red-600 text-white flex-1 md:flex-none" onclick={cancelGeneration}>
+            Cancel
+          </button>
+        {:else}
+          <button
+            class="btn bg-primary text-btn-primary-text hover:opacity-90 flex-1 md:flex-none"
+            onclick={generate}
+            disabled={!inputText.trim() || !$selectedModelStore}
+          >
+            Generate
+          </button>
+          <button
+            class="btn flex-1 md:flex-none"
+            onclick={clearInput}
+            disabled={!inputText.trim()}
+          >
+            Clear
+          </button>
+          <label class="flex items-center justify-center gap-2 text-sm cursor-pointer">
+            <input
+              type="checkbox"
+              bind:checked={$autoPlayStore}
+              class="cursor-pointer"
+            />
+            Auto-play
+          </label>
+        {/if}
+      </div>
+    </div>
+  {/if}
+</div>

ui-svelte/src/index.css

@@ -1,4 +1,5 @@
 @import "tailwindcss";
+@import "katex/dist/katex.min.css";
 @custom-variant dark (&:where([data-theme=dark], [data-theme=dark] *));
 
 @theme {

ui-svelte/src/lib/audioApi.ts

@@ -0,0 +1,24 @@
+import type { AudioTranscriptionResponse } from "./types";
+
+export async function transcribeAudio(
+  model: string,
+  file: File,
+  signal?: AbortSignal
+): Promise<AudioTranscriptionResponse> {
+  const formData = new FormData();
+  formData.append("file", file);
+  formData.append("model", model);
+
+  const response = await fetch("/v1/audio/transcriptions", {
+    method: "POST",
+    body: formData,
+    signal,
+  });
+
+  if (!response.ok) {
+    const errorText = await response.text();
+    throw new Error(`Audio API error: ${response.status} - ${errorText}`);
+  }
+
+  return response.json();
+}

ui-svelte/src/lib/chatApi.ts

@@ -0,0 +1,108 @@
+import type { ChatMessage, ChatCompletionRequest } from "./types";
+
+export interface StreamChunk {
+  content: string;
+  reasoning_content?: string;
+  done: boolean;
+}
+
+export interface ChatOptions {
+  temperature?: number;
+}
+
+function parseSSELine(line: string): StreamChunk | null {
+  const trimmed = line.trim();
+  if (!trimmed || !trimmed.startsWith("data: ")) {
+    return null;
+  }
+
+  const data = trimmed.slice(6);
+  if (data === "[DONE]") {
+    return { content: "", done: true };
+  }
+
+  try {
+    const parsed = JSON.parse(data);
+    const delta = parsed.choices?.[0]?.delta;
+    const content = delta?.content || "";
+    const reasoning_content = delta?.reasoning_content || "";
+
+    if (content || reasoning_content) {
+      return { content, reasoning_content, done: false };
+    }
+    return null;
+  } catch {
+    return null;
+  }
+}
+
+export async function* streamChatCompletion(
+  model: string,
+  messages: ChatMessage[],
+  signal?: AbortSignal,
+  options?: ChatOptions
+): AsyncGenerator<StreamChunk> {
+  const request: ChatCompletionRequest = {
+    model,
+    messages,
+    stream: true,
+    temperature: options?.temperature,
+  };
+
+  const response = await fetch("/v1/chat/completions", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(request),
+    signal,
+  });
+
+  if (!response.ok) {
+    const errorText = await response.text();
+    throw new Error(`Chat API error: ${response.status} - ${errorText}`);
+  }
+
+  const reader = response.body?.getReader();
+  if (!reader) {
+    throw new Error("Response body is not readable");
+  }
+
+  const decoder = new TextDecoder();
+  let buffer = "";
+
+  try {
+    while (true) {
+      const { done, value } = await reader.read();
+
+      if (done) {
+        break;
+      }
+
+      buffer += decoder.decode(value, { stream: true });
+      const lines = buffer.split("\n");
+      buffer = lines.pop() || "";
+
+      for (const line of lines) {
+        const result = parseSSELine(line);
+        if (result?.done) {
+          yield result;
+          return;
+        }
+        if (result) {
+          yield result;
+        }
+      }
+    }
+
+    // Process any remaining buffer
+    const result = parseSSELine(buffer);
+    if (result && !result.done) {
+      yield result;
+    }
+
+    yield { content: "", done: true };
+  } finally {
+    reader.releaseLock();
+  }
+}

ui-svelte/src/lib/imageApi.ts

@@ -0,0 +1,31 @@
+import type { ImageGenerationRequest, ImageGenerationResponse } from "./types";
+
+export async function generateImage(
+  model: string,
+  prompt: string,
+  size: string,
+  signal?: AbortSignal
+): Promise<ImageGenerationResponse> {
+  const request: ImageGenerationRequest = {
+    model,
+    prompt,
+    n: 1,
+    size,
+  };
+
+  const response = await fetch("/v1/images/generations", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(request),
+    signal,
+  });
+
+  if (!response.ok) {
+    const errorText = await response.text();
+    throw new Error(`Image API error: ${response.status} - ${errorText}`);
+  }
+
+  return response.json();
+}

ui-svelte/src/lib/markdown.test.ts

@@ -0,0 +1,423 @@
+import { describe, it, expect } from "vitest";
+import { renderMarkdown, escapeHtml, splitCompleteBlocks, closePendingBlock, normalizeLatexDelimiters, renderStreamingMarkdown, createStreamingCache } from "./markdown";
+
+describe("renderMarkdown", () => {
+  describe("basic markdown", () => {
+    it("renders plain text", () => {
+      const result = renderMarkdown("Hello world");
+      expect(result).toContain("Hello world");
+    });
+
+    it("renders bold text", () => {
+      const result = renderMarkdown("**bold**");
+      expect(result).toContain("<strong>bold</strong>");
+    });
+
+    it("renders italic text", () => {
+      const result = renderMarkdown("*italic*");
+      expect(result).toContain("<em>italic</em>");
+    });
+
+    it("renders code blocks", () => {
+      const result = renderMarkdown("```js\nconst x = 1;\n```");
+      expect(result).toContain("hljs");
+      expect(result).toContain("const");
+    });
+
+    it("returns empty string for empty content", () => {
+      const result = renderMarkdown("");
+      expect(result).toBe("");
+    });
+
+    it("returns empty string for null/undefined content", () => {
+      // @ts-expect-error - testing null input
+      expect(renderMarkdown(null)).toBe("");
+      // @ts-expect-error - testing undefined input
+      expect(renderMarkdown(undefined)).toBe("");
+    });
+  });
+
+  describe("KaTeX math rendering", () => {
+    it("renders inline math with $...$ syntax", () => {
+      const result = renderMarkdown("The equation $E = mc^2$ is famous.");
+      // KaTeX should convert this to HTML with katex class
+      expect(result).toContain("katex");
+      expect(result).toContain("E");
+      expect(result).toContain("=");
+      expect(result).toContain("mc");
+    });
+
+    it("renders display math with $$...$$ syntax", () => {
+      const result = renderMarkdown("$$\\int_{a}^{b} f(x) dx$$");
+      // Math should be rendered with KaTeX
+      expect(result).toContain("katex");
+      expect(result).toContain("∫");
+      expect(result).toContain("f(x)");
+    });
+
+    it("renders complex LaTeX expressions", () => {
+      const result = renderMarkdown("$$\\sum_{i=1}^{n} x_i = \\frac{1}{n}\\sum_{i=1}^{n} x_i$$");
+      expect(result).toContain("katex");
+      expect(result).toContain("∑"); // or the MathML equivalent
+    });
+
+    it("renders LaTeX with Greek letters", () => {
+      const result = renderMarkdown("$\\alpha + \\beta = \\gamma$");
+      expect(result).toContain("katex");
+      // Greek letters should be rendered
+      expect(result).toMatch(/[αβγ]|alpha|beta|gamma/);
+    });
+
+    it("renders LaTeX with fractions", () => {
+      const result = renderMarkdown("$\\frac{a}{b}$");
+      expect(result).toContain("katex");
+      expect(result).toContain("frac");
+    });
+
+    it("renders LaTeX with subscripts and superscripts", () => {
+      const result = renderMarkdown("$x^2 + y_3$");
+      expect(result).toContain("katex");
+      expect(result).toContain("sup"); // superscript
+      expect(result).toContain("sub"); // subscript
+    });
+
+    it("renders multiple inline math expressions in one paragraph", () => {
+      const result = renderMarkdown("First $x = 1$ and then $y = 2$.");
+      // Should contain multiple katex spans
+      const katexMatches = result.match(/katex/g);
+      expect(katexMatches?.length).toBeGreaterThanOrEqual(2);
+    });
+
+    it("renders math within a larger markdown document", () => {
+      const markdown = `# Heading
+
+This is a paragraph with $E = mc^2$ inline math.
+
+$$\\int_0^\\infty e^{-x} dx = 1$$
+
+More text here.
+`;
+      const result = renderMarkdown(markdown);
+      expect(result).toContain("<h1>Heading</h1>");
+      expect(result).toContain("katex");
+      // Both inline and display math should be rendered
+      expect(result).toContain("E = mc");
+      expect(result).toContain("∫");
+      expect(result).toContain("∞");
+    });
+
+    it("handles escaped dollar signs", () => {
+      const result = renderMarkdown("This costs \\$5 and $x = 1$.");
+      // Should render the escaped $5 as text and the math
+      expect(result).toContain("katex");
+      expect(result).toContain("$5");
+    });
+
+    it("handles empty math expressions gracefully", () => {
+      // Empty math should not break the renderer
+      const result = renderMarkdown("$$$");
+      expect(result).toBeTruthy();
+    });
+
+    it("renders LaTeX matrices", () => {
+      const result = renderMarkdown("$$\\begin{pmatrix} a & b \\\\ c & d \\end{pmatrix}$$");
+      expect(result).toContain("katex");
+      expect(result).toContain("pmatrix");
+    });
+
+    it("renders LaTeX square roots", () => {
+      const result = renderMarkdown("$\\sqrt{x^2 + y^2}$");
+      expect(result).toContain("katex");
+      expect(result).toContain("sqrt");
+    });
+
+    it("renders \\[...\\] display math", () => {
+      const result = renderMarkdown("\\[\nx^2 + y^2 = z^2\n\\]");
+      expect(result).toContain("katex");
+    });
+
+    it("renders \\(...\\) inline math", () => {
+      const result = renderMarkdown("The equation \\(E = mc^2\\) is famous.");
+      expect(result).toContain("katex");
+    });
+  });
+
+  describe("normalizeLatexDelimiters", () => {
+    it("converts \\[...\\] to $$...$$", () => {
+      expect(normalizeLatexDelimiters("\\[\nx^2\n\\]")).toBe("$$\nx^2\n$$");
+    });
+
+    it("converts \\(...\\) to $...$", () => {
+      expect(normalizeLatexDelimiters("\\(x^2\\)")).toBe("$x^2$");
+    });
+
+    it("leaves $$ and $ delimiters unchanged", () => {
+      const text = "$$x^2$$ and $y$";
+      expect(normalizeLatexDelimiters(text)).toBe(text);
+    });
+
+    it("handles multiple occurrences", () => {
+      expect(normalizeLatexDelimiters("\\(a\\) and \\(b\\)")).toBe("$a$ and $b$");
+    });
+  });
+
+  describe("escapeHtml", () => {
+    it("escapes HTML entities", () => {
+      expect(escapeHtml("<script>")).toBe("&lt;script&gt;");
+      expect(escapeHtml('"quoted"')).toBe("&quot;quoted&quot;");
+      expect(escapeHtml("'single'")).toBe("&#39;single&#39;");
+      expect(escapeHtml("a & b")).toBe("a &amp; b");
+    });
+
+    it("handles empty string", () => {
+      expect(escapeHtml("")).toBe("");
+    });
+  });
+
+  describe("error handling", () => {
+    it("does not throw on invalid LaTeX syntax", () => {
+      // Invalid LaTeX should not crash the renderer
+      expect(() => renderMarkdown("$\\invalidcommand{")).not.toThrow();
+    });
+
+    it("returns fallback HTML on processing errors", () => {
+      // Very large or malformed input should be handled
+      const result = renderMarkdown("$" + "a".repeat(10000) + "$");
+      expect(result).toBeTruthy();
+    });
+  });
+});
+
+describe("splitCompleteBlocks", () => {
+  it("returns everything as pending when no blank line", () => {
+    const result = splitCompleteBlocks("Hello world");
+    expect(result.complete).toBe("");
+    expect(result.pending).toBe("Hello world");
+  });
+
+  it("returns empty for empty input", () => {
+    const result = splitCompleteBlocks("");
+    expect(result.complete).toBe("");
+    expect(result.pending).toBe("");
+  });
+
+  it("splits on blank line between paragraphs", () => {
+    const result = splitCompleteBlocks("First paragraph.\n\nSecond paragraph");
+    expect(result.complete).toBe("First paragraph.\n");
+    expect(result.pending).toBe("Second paragraph");
+  });
+
+  it("splits multiple paragraphs at last blank line", () => {
+    const result = splitCompleteBlocks("Para 1.\n\nPara 2.\n\nPara 3");
+    expect(result.complete).toBe("Para 1.\n\nPara 2.\n");
+    expect(result.pending).toBe("Para 3");
+  });
+
+  it("treats closed code fence as complete boundary", () => {
+    const text = "```js\nconst x = 1;\n```\nMore text";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("```js\nconst x = 1;\n```");
+    expect(result.pending).toBe("More text");
+  });
+
+  it("treats unclosed code fence as pending", () => {
+    const text = "Done paragraph.\n\n```js\nconst x = 1;";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("Done paragraph.\n");
+    expect(result.pending).toBe("```js\nconst x = 1;");
+  });
+
+  it("does not split on blank lines inside code fences", () => {
+    const text = "```\nline1\n\nline2\n```";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("```\nline1\n\nline2\n```");
+    expect(result.pending).toBe("");
+  });
+
+  it("handles tilde fences", () => {
+    const text = "~~~py\nprint('hi')\n~~~\nAfter";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("~~~py\nprint('hi')\n~~~");
+    expect(result.pending).toBe("After");
+  });
+
+  it("does not close backtick fence with tilde fence", () => {
+    const text = "```\ncode\n~~~\nstill code";
+    const result = splitCompleteBlocks(text);
+    // The ~~~ should not close a backtick fence, so everything from ``` onward is pending
+    expect(result.complete).toBe("");
+    expect(result.pending).toBe("```\ncode\n~~~\nstill code");
+  });
+
+  it("treats closed math block as complete boundary", () => {
+    const text = "$$\nx^2\n$$\nAfter";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("$$\nx^2\n$$");
+    expect(result.pending).toBe("After");
+  });
+
+  it("treats unclosed math block as pending", () => {
+    const text = "Before.\n\n$$\nx^2";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("Before.\n");
+    expect(result.pending).toBe("$$\nx^2");
+  });
+
+  it("treats closed \\[...\\] math block as complete boundary", () => {
+    const text = "\\[\nx^2\n\\]\nAfter";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("\\[\nx^2\n\\]");
+    expect(result.pending).toBe("After");
+  });
+
+  it("treats unclosed \\[ math block as pending", () => {
+    const text = "Before.\n\n\\[\nx^2";
+    const result = splitCompleteBlocks(text);
+    expect(result.complete).toBe("Before.\n");
+    expect(result.pending).toBe("\\[\nx^2");
+  });
+
+  it("handles trailing blank line making everything complete", () => {
+    const text = "Hello world.\n";
+    const result = splitCompleteBlocks(text);
+    // Last line is empty string after split, which is a blank line
+    expect(result.complete).toBe("Hello world.\n");
+    expect(result.pending).toBe("");
+  });
+});
+
+describe("closePendingBlock", () => {
+  it("returns empty string for empty input", () => {
+    expect(closePendingBlock("")).toBe("");
+  });
+
+  it("returns plain text unchanged", () => {
+    expect(closePendingBlock("Hello world")).toBe("Hello world");
+  });
+
+  it("closes an open backtick code fence", () => {
+    const result = closePendingBlock("```python\nprint('hi')");
+    expect(result).toBe("```python\nprint('hi')\n```");
+  });
+
+  it("closes an open tilde code fence", () => {
+    const result = closePendingBlock("~~~js\nconst x = 1;");
+    expect(result).toBe("~~~js\nconst x = 1;\n~~~");
+  });
+
+  it("does not modify already-closed code fence", () => {
+    const text = "```py\ncode\n```";
+    expect(closePendingBlock(text)).toBe(text);
+  });
+
+  it("closes an open math block", () => {
+    const result = closePendingBlock("$$\nx^2 + y^2");
+    expect(result).toBe("$$\nx^2 + y^2\n$$");
+  });
+
+  it("does not modify already-closed math block", () => {
+    const text = "$$\nx^2\n$$";
+    expect(closePendingBlock(text)).toBe(text);
+  });
+
+  it("closes an open \\[ math block with \\]", () => {
+    const result = closePendingBlock("\\[\nx^2 + y^2");
+    expect(result).toBe("\\[\nx^2 + y^2\n\\]");
+  });
+
+  it("does not modify already-closed \\[...\\] math block", () => {
+    const text = "\\[\nx^2\n\\]";
+    expect(closePendingBlock(text)).toBe(text);
+  });
+
+  it("closes code fence when preceded by regular text", () => {
+    const result = closePendingBlock("Some text\n```\ncode");
+    expect(result).toBe("Some text\n```\ncode\n```");
+  });
+
+  it("leaves headers unchanged", () => {
+    expect(closePendingBlock("## Hello")).toBe("## Hello");
+  });
+
+  it("leaves tables unchanged", () => {
+    const table = "| a | b |\n| --- | --- |\n| 1 | 2 |";
+    expect(closePendingBlock(table)).toBe(table);
+  });
+
+  it("leaves lists unchanged", () => {
+    expect(closePendingBlock("- item 1\n- item 2")).toBe("- item 1\n- item 2");
+  });
+});
+
+describe("renderStreamingMarkdown", () => {
+  it("renders complete blocks and pending as markdown", () => {
+    const cache = createStreamingCache();
+    const text = "# Hello\n\nWorld";
+    const { blocks, pendingHtml } = renderStreamingMarkdown(text, cache);
+    expect(blocks).toHaveLength(1);
+    expect(blocks[0].html).toContain("<h1>Hello</h1>");
+    expect(pendingHtml).toContain("World");
+    expect(pendingHtml).toContain("<p>");
+  });
+
+  it("preserves existing blocks when complete portion is unchanged", () => {
+    const cache = createStreamingCache();
+    renderStreamingMarkdown("# Hello\n\nWor", cache);
+    const firstBlocks = cache.blocks;
+
+    const { blocks } = renderStreamingMarkdown("# Hello\n\nWorld", cache);
+    // Same block array reference — nothing changed in the complete section
+    expect(blocks).toBe(firstBlocks);
+    expect(cache.completeKey).toBe("# Hello\n");
+  });
+
+  it("appends a new block when a new section completes", () => {
+    const cache = createStreamingCache();
+    renderStreamingMarkdown("# Hello\n\nParagraph", cache);
+    expect(cache.blocks).toHaveLength(1);
+    const firstBlock = cache.blocks[0];
+
+    renderStreamingMarkdown("# Hello\n\nParagraph.\n\nMore", cache);
+    expect(cache.blocks).toHaveLength(2);
+    // First block is preserved with the same id and html
+    expect(cache.blocks[0].id).toBe(firstBlock.id);
+    expect(cache.blocks[0].html).toBe(firstBlock.html);
+    // Second block contains the new paragraph
+    expect(cache.blocks[1].html).toContain("Paragraph.");
+  });
+
+  it("assigns unique stable ids to each block", () => {
+    const cache = createStreamingCache();
+    renderStreamingMarkdown("A.\n\nB.\n\nC", cache);
+    expect(cache.blocks).toHaveLength(1);
+    const id0 = cache.blocks[0].id;
+
+    renderStreamingMarkdown("A.\n\nB.\n\nC.\n\nD", cache);
+    expect(cache.blocks).toHaveLength(2);
+    expect(cache.blocks[0].id).toBe(id0);
+    expect(cache.blocks[1].id).toBe(id0 + 1);
+  });
+
+  it("renders pending code block with syntax highlighting", () => {
+    const cache = createStreamingCache();
+    const text = "Done.\n\n```python\nprint('hello')";
+    const { pendingHtml } = renderStreamingMarkdown(text, cache);
+    expect(pendingHtml).toContain("<code");
+    expect(pendingHtml).toContain("hljs");
+  });
+
+  it("renders pending table as markdown", () => {
+    const cache = createStreamingCache();
+    const text = "Done.\n\n| a | b |\n| --- | --- |\n| 1 | 2 |";
+    const { pendingHtml } = renderStreamingMarkdown(text, cache);
+    expect(pendingHtml).toContain("<table>");
+    expect(pendingHtml).toContain("<td>");
+  });
+
+  it("renders pending portion through markdown pipeline", () => {
+    const cache = createStreamingCache();
+    const text = "Done.\n\nSome **bold** text";
+    const { pendingHtml } = renderStreamingMarkdown(text, cache);
+    expect(pendingHtml).toContain("<strong>bold</strong>");
+  });
+});

ui-svelte/src/lib/markdown.ts

@@ -0,0 +1,260 @@
+import { unified } from "unified";
+import remarkParse from "remark-parse";
+import remarkGfm from "remark-gfm";
+import remarkMath from "remark-math";
+import remarkRehype from "remark-rehype";
+import rehypeKatex from "rehype-katex";
+import rehypeStringify from "rehype-stringify";
+import hljs from "highlight.js";
+import { visit } from "unist-util-visit";
+import type { Element, Root } from "hast";
+
+// Custom plugin to highlight code blocks with highlight.js
+function rehypeHighlight() {
+  return (tree: Root) => {
+    visit(tree, "element", (node: Element) => {
+      if (node.tagName === "code" && node.properties) {
+        const className = node.properties.className;
+        const classes = Array.isArray(className)
+          ? className.filter((c): c is string => typeof c === "string")
+          : [];
+        const lang = classes
+          .find((c) => c.startsWith("language-"))
+          ?.replace("language-", "");
+
+        const text = node.children
+          .filter((child): child is { type: "text"; value: string } => child.type === "text")
+          .map((child) => child.value)
+          .join("");
+
+        if (text) {
+          const language = lang && hljs.getLanguage(lang) ? lang : "plaintext";
+          const highlighted = hljs.highlight(text, { language }).value;
+
+          // Replace the text node with raw HTML
+          node.properties.className = [
+            "hljs",
+            `language-${language}`,
+            ...classes.filter((c) => !c.startsWith("language-")),
+          ];
+          // Use type assertion since we're modifying the tree structure
+          (node.children as unknown) = [
+            { type: "raw", value: highlighted },
+          ];
+        }
+      }
+    });
+  };
+}
+
+
+export function escapeHtml(text: string): string {
+  const htmlEntities: Record<string, string> = {
+    "&": "&amp;",
+    "<": "&lt;",
+    ">": "&gt;",
+    '"': "&quot;",
+    "'": "&#39;",
+  };
+  return text.replace(/[&<>"']/g, (char) => htmlEntities[char]);
+}
+
+// Create the unified processor
+const processor = unified()
+  .use(remarkParse)
+  .use(remarkGfm)
+  .use(remarkMath)
+  .use(remarkRehype, { allowDangerousHtml: true })
+  .use(rehypeKatex)
+  .use(rehypeHighlight)
+  .use(rehypeStringify, { allowDangerousHtml: true });
+
+export function splitCompleteBlocks(text: string): { complete: string; pending: string } {
+  if (!text) {
+    return { complete: "", pending: "" };
+  }
+
+  const lines = text.split("\n");
+  let lastCompleteBoundary = -1; // index of last line that ends a complete block
+  let inFence = false;
+  let fenceChar = "";
+  let inMathBlock = false;
+
+  for (let i = 0; i < lines.length; i++) {
+    const trimmed = lines[i].trimEnd();
+
+    if (inFence) {
+      // Check for closing fence: same character, at least 3, no other content
+      if (new RegExp(`^\\s*${fenceChar.replace(/~/g, "\\~")}{3,}\\s*$`).test(trimmed)) {
+        inFence = false;
+        fenceChar = "";
+        lastCompleteBoundary = i;
+      }
+      continue;
+    }
+
+    if (inMathBlock) {
+      if (trimmed === "$$" || trimmed === "\\]") {
+        inMathBlock = false;
+        lastCompleteBoundary = i;
+      }
+      continue;
+    }
+
+    // Check for opening fence
+    const fenceMatch = trimmed.match(/^(\s*)(```|~~~)/);
+    if (fenceMatch) {
+      // Check if it's an opening fence (may have language info after)
+      // A line with just ``` or ~~~ could be opening or closing, but since we're not in a fence it's opening
+      fenceChar = fenceMatch[2][0]; // '`' or '~'
+      inFence = true;
+      continue;
+    }
+
+    // Check for opening math block
+    if (trimmed === "$$" || trimmed === "\\[") {
+      inMathBlock = true;
+      continue;
+    }
+
+    // Outside fences/math: blank line marks a complete boundary
+    if (trimmed === "") {
+      lastCompleteBoundary = i;
+    }
+  }
+
+  if (lastCompleteBoundary < 0) {
+    return { complete: "", pending: text };
+  }
+
+  const completeLines = lines.slice(0, lastCompleteBoundary + 1);
+  const pendingLines = lines.slice(lastCompleteBoundary + 1);
+
+  return {
+    complete: completeLines.join("\n"),
+    pending: pendingLines.join("\n"),
+  };
+}
+
+export function closePendingBlock(pending: string): string {
+  if (!pending) return "";
+
+  const lines = pending.split("\n");
+  let inFence = false;
+  let fenceStr = "";
+  let inMathBlock = false;
+  let mathClose = "";
+
+  for (const line of lines) {
+    const trimmed = line.trimEnd();
+
+    if (inFence) {
+      if (new RegExp(`^\\s*${fenceStr[0] === "~" ? "~~~" : "\\`\\`\\`"}\\s*$`).test(trimmed)) {
+        inFence = false;
+        fenceStr = "";
+      }
+      continue;
+    }
+
+    if (inMathBlock) {
+      if (trimmed === "$$" || trimmed === "\\]") {
+        inMathBlock = false;
+        mathClose = "";
+      }
+      continue;
+    }
+
+    const fenceMatch = trimmed.match(/^(\s*)(```|~~~)/);
+    if (fenceMatch) {
+      fenceStr = fenceMatch[2];
+      inFence = true;
+      continue;
+    }
+
+    if (trimmed === "$$") {
+      inMathBlock = true;
+      mathClose = "$$";
+      continue;
+    }
+
+    if (trimmed === "\\[") {
+      inMathBlock = true;
+      mathClose = "\\]";
+      continue;
+    }
+  }
+
+  if (inFence) return pending + "\n" + fenceStr;
+  if (inMathBlock) return pending + "\n" + mathClose;
+  return pending;
+}
+
+export interface RenderedBlock {
+  id: number;
+  html: string;
+}
+
+export interface StreamingCache {
+  blocks: RenderedBlock[];
+  nextId: number;
+  completeKey: string;
+}
+
+export function createStreamingCache(): StreamingCache {
+  return { blocks: [], nextId: 0, completeKey: "" };
+}
+
+export function renderStreamingMarkdown(
+  text: string,
+  cache: StreamingCache,
+): { blocks: RenderedBlock[]; pendingHtml: string } {
+  const { complete, pending } = splitCompleteBlocks(text);
+
+  if (complete) {
+    if (cache.completeKey !== complete) {
+      if (complete.startsWith(cache.completeKey) && cache.completeKey.length > 0) {
+        // Complete section grew — render only the new part as a new block
+        const newPart = complete.slice(cache.completeKey.length);
+        cache.blocks = [...cache.blocks, { id: cache.nextId++, html: renderMarkdown(newPart) }];
+      } else {
+        // Complete section changed unexpectedly — re-render as single block
+        cache.blocks = [{ id: cache.nextId++, html: renderMarkdown(complete) }];
+      }
+      cache.completeKey = complete;
+    }
+  } else if (cache.blocks.length > 0) {
+    cache.blocks = [];
+    cache.completeKey = "";
+  }
+
+  let pendingHtml = "";
+  if (pending) {
+    const closed = closePendingBlock(pending);
+    pendingHtml = renderMarkdown(closed);
+  }
+
+  return { blocks: cache.blocks, pendingHtml };
+}
+
+// Convert \[...\] to $$...$$ and \(...\) to $...$
+export function normalizeLatexDelimiters(text: string): string {
+  // Display math: \[...\] → $$...$$  (may span multiple lines)
+  text = text.replace(/\\\[([\s\S]*?)\\\]/g, (_match, inner) => `$$${inner}$$`);
+  // Inline math: \(...\) → $...$
+  text = text.replace(/\\\(([\s\S]*?)\\\)/g, (_match, inner) => `$${inner}$`);
+  return text;
+}
+
+export function renderMarkdown(content: string): string {
+  if (!content) {
+    return "";
+  }
+
+  try {
+    const result = processor.processSync(normalizeLatexDelimiters(content));
+    return String(result);
+  } catch {
+    // Fallback to escaped plain text if markdown parsing fails
+    return `<p>${escapeHtml(content)}</p>`;
+  }
+}

ui-svelte/src/lib/modelUtils.ts

@@ -0,0 +1,24 @@
+import type { Model } from "./types";
+
+export interface GroupedModels {
+  local: Model[];
+  peersByProvider: Record<string, Model[]>;
+}
+
+export function groupModels(models: Model[]): GroupedModels {
+  const available = models.filter((m) => !m.unlisted);
+  const local = available.filter((m) => !m.peerID);
+  const peerModels = available.filter((m) => m.peerID);
+
+  const peersByProvider = peerModels.reduce(
+    (acc, model) => {
+      const peerId = model.peerID || "unknown";
+      if (!acc[peerId]) acc[peerId] = [];
+      acc[peerId].push(model);
+      return acc;
+    },
+    {} as Record<string, Model[]>
+  );
+
+  return { local, peersByProvider };
+}

ui-svelte/src/lib/speechApi.ts

@@ -0,0 +1,30 @@
+import type { SpeechGenerationRequest } from "./types";
+
+export async function generateSpeech(
+  model: string,
+  input: string,
+  voice: string,
+  signal?: AbortSignal
+): Promise<Blob> {
+  const request: SpeechGenerationRequest = {
+    model,
+    input,
+    voice,
+  };
+
+  const response = await fetch("/v1/audio/speech", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(request),
+    signal,
+  });
+
+  if (!response.ok) {
+    const errorText = await response.text();
+    throw new Error(`Speech API error: ${response.status} - ${errorText}`);
+  }
+
+  return response.blob();
+}

ui-svelte/src/lib/types.ts

@@ -21,6 +21,16 @@ export interface Metrics {
   prompt_per_second: number;
   tokens_per_second: number;
   duration_ms: number;
+  has_capture: boolean;
+}
+
+export interface ReqRespCapture {
+  id: number;
+  req_path: string;
+  req_headers: Record<string, string>;
+  req_body: string; // base64 encoded bytes
+  resp_headers: Record<string, string>;
+  resp_body: string; // base64 encoded bytes
 }
 
 export interface LogData {
@@ -28,8 +38,12 @@ export interface LogData {
   data: string;
 }
 
+export interface InFlightStats {
+  total: number;
+}
+
 export interface APIEventEnvelope {
-  type: "modelStatus" | "logData" | "metrics";
+  type: "modelStatus" | "logData" | "metrics" | "inflight";
   data: string;
 }
 
@@ -40,3 +54,77 @@ export interface VersionInfo {
 }
 
 export type ScreenWidth = "xs" | "sm" | "md" | "lg" | "xl" | "2xl";
+
+export type TextContentPart = {
+  type: "text";
+  text: string;
+};
+
+export type ImageContentPart = {
+  type: "image_url";
+  image_url: { url: string };
+};
+
+export type ContentPart = TextContentPart | ImageContentPart;
+
+export interface ChatMessage {
+  role: "user" | "assistant" | "system";
+  content: string | ContentPart[];
+  reasoning_content?: string;
+  reasoningTimeMs?: number;
+}
+
+export function getTextContent(content: string | ContentPart[]): string {
+  if (typeof content === "string") {
+    return content;
+  }
+  const textParts = content.filter((part): part is TextContentPart => part.type === "text");
+  return textParts.map((part) => part.text).join("\n");
+}
+
+export function getImageUrls(content: string | ContentPart[]): string[] {
+  if (typeof content === "string") {
+    return [];
+  }
+  return content
+    .filter((part): part is ImageContentPart => part.type === "image_url")
+    .map((part) => part.image_url.url);
+}
+
+export interface ChatCompletionRequest {
+  model: string;
+  messages: ChatMessage[];
+  stream: boolean;
+  temperature?: number;
+  max_tokens?: number;
+}
+
+export interface ImageGenerationRequest {
+  model: string;
+  prompt: string;
+  n?: number;
+  size?: string;
+}
+
+export interface ImageGenerationResponse {
+  created: number;
+  data: Array<{
+    url?: string;
+    b64_json?: string;
+  }>;
+}
+
+export interface AudioTranscriptionRequest {
+  file: File;
+  model: string;
+}
+
+export interface AudioTranscriptionResponse {
+  text: string;
+}
+
+export interface SpeechGenerationRequest {
+  model: string;
+  input: string;
+  voice: string;
+}

ui-svelte/src/main.ts

@@ -1,4 +1,5 @@
 import "./index.css";
+import "highlight.js/styles/github-dark.css";
 import App from "./App.svelte";
 import { mount } from "svelte";
 

ui-svelte/src/routes/Activity.svelte

@@ -1,6 +1,8 @@
 <script lang="ts">
-  import { metrics } from "../stores/api";
+  import { metrics, getCapture } from "../stores/api";
   import Tooltip from "../components/Tooltip.svelte";
+  import CaptureDialog from "../components/CaptureDialog.svelte";
+  import type { ReqRespCapture } from "../lib/types";
 
   function formatSpeed(speed: number): string {
     return speed < 0 ? "unknown" : speed.toFixed(2) + " t/s";
@@ -38,6 +40,25 @@
   }
 
   let sortedMetrics = $derived([...$metrics].sort((a, b) => b.id - a.id));
+
+  let selectedCapture = $state<ReqRespCapture | null>(null);
+  let dialogOpen = $state(false);
+  let loadingCaptureId = $state<number | null>(null);
+
+  async function viewCapture(id: number) {
+    loadingCaptureId = id;
+    const capture = await getCapture(id);
+    loadingCaptureId = null;
+    if (capture) {
+      selectedCapture = capture;
+      dialogOpen = true;
+    }
+  }
+
+  function closeDialog() {
+    dialogOpen = false;
+    selectedCapture = null;
+  }
 </script>
 
 <div class="p-2">
@@ -65,6 +86,7 @@
             <th class="px-6 py-3">Prompt Processing</th>
             <th class="px-6 py-3">Generation Speed</th>
             <th class="px-6 py-3">Duration</th>
+            <th class="px-6 py-3">Capture</th>
           </tr>
         </thead>
         <tbody class="divide-y">
@@ -79,6 +101,19 @@
               <td class="px-6 py-4">{formatSpeed(metric.prompt_per_second)}</td>
               <td class="px-6 py-4">{formatSpeed(metric.tokens_per_second)}</td>
               <td class="px-6 py-4">{formatDuration(metric.duration_ms)}</td>
+              <td class="px-6 py-4">
+                {#if metric.has_capture}
+                  <button
+                    onclick={() => viewCapture(metric.id)}
+                    disabled={loadingCaptureId === metric.id}
+                    class="btn btn--sm"
+                  >
+                    {loadingCaptureId === metric.id ? "..." : "View"}
+                  </button>
+                {:else}
+                  <span class="text-txtsecondary">-</span>
+                {/if}
+              </td>
             </tr>
           {/each}
         </tbody>
@@ -86,3 +121,5 @@
     </div>
   {/if}
 </div>
+
+<CaptureDialog capture={selectedCapture} open={dialogOpen} onclose={closeDialog} />

ui-svelte/src/routes/Playground.svelte

@@ -0,0 +1,99 @@
+<script lang="ts">
+  import { persistentStore } from "../stores/persistent";
+  import ChatInterface from "../components/playground/ChatInterface.svelte";
+  import ImageInterface from "../components/playground/ImageInterface.svelte";
+  import AudioInterface from "../components/playground/AudioInterface.svelte";
+  import SpeechInterface from "../components/playground/SpeechInterface.svelte";
+
+  type Tab = "chat" | "images" | "speech" | "audio";
+
+  const selectedTabStore = persistentStore<Tab>("playground-selected-tab", "chat");
+  let mobileMenuOpen = $state(false);
+
+  const tabs: { id: Tab; label: string }[] = [
+    { id: "chat", label: "Chat" },
+    { id: "images", label: "Images" },
+    { id: "speech", label: "Speech" },
+    { id: "audio", label: "Transcription" },
+  ];
+
+  function selectTab(tab: Tab) {
+    selectedTabStore.set(tab);
+    mobileMenuOpen = false;
+  }
+
+  function getTabLabel(tabId: Tab): string {
+    return tabs.find(t => t.id === tabId)?.label || "";
+  }
+</script>
+
+<div class="card h-full flex flex-col">
+  <!-- Tab navigation -->
+  <div class="shrink-0 mb-4">
+    <!-- Mobile: Dropdown menu (hidden on md and up) -->
+    <div class="block md:hidden relative">
+      <button
+        class="w-full px-4 py-2 rounded font-medium transition-colors flex items-center justify-between bg-surface hover:bg-secondary-hover border border-gray-200 dark:border-white/10"
+        onclick={() => (mobileMenuOpen = !mobileMenuOpen)}
+      >
+        <span>{getTabLabel($selectedTabStore)}</span>
+        <svg
+          class="w-5 h-5 transition-transform {mobileMenuOpen ? 'rotate-180' : ''}"
+          fill="none"
+          stroke="currentColor"
+          viewBox="0 0 24 24"
+        >
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"></path>
+        </svg>
+      </button>
+      {#if mobileMenuOpen}
+        <div class="absolute top-full left-0 right-0 mt-1 bg-surface border border-gray-200 dark:border-white/10 rounded shadow-lg z-10">
+          {#each tabs as tab (tab.id)}
+            <button
+              class="w-full px-4 py-2 text-left hover:bg-secondary-hover transition-colors first:rounded-t last:rounded-b {$selectedTabStore === tab.id ? 'bg-primary/10 font-medium' : ''}"
+              onclick={() => selectTab(tab.id)}
+            >
+              {tab.label}
+            </button>
+          {/each}
+        </div>
+      {/if}
+    </div>
+
+    <!-- Desktop: Tab buttons (shown on md and up) -->
+    <div class="hidden md:flex flex-wrap gap-2">
+      {#each tabs as tab (tab.id)}
+        <button
+          class="px-4 py-2 rounded font-medium transition-colors {$selectedTabStore === tab.id
+            ? 'bg-primary text-btn-primary-text'
+            : 'bg-surface hover:bg-secondary-hover border border-gray-200 dark:border-white/10'}"
+          onclick={() => selectTab(tab.id)}
+        >
+          {tab.label}
+        </button>
+      {/each}
+    </div>
+  </div>
+
+  <!-- Tab content -->
+  <div class="flex-1 overflow-hidden relative">
+    <div class="h-full" class:tab-hidden={$selectedTabStore !== "chat"}>
+      <ChatInterface />
+    </div>
+    <div class="h-full" class:tab-hidden={$selectedTabStore !== "images"}>
+      <ImageInterface />
+    </div>
+    <div class="h-full" class:tab-hidden={$selectedTabStore !== "speech"}>
+      <SpeechInterface />
+    </div>
+    <div class="h-full" class:tab-hidden={$selectedTabStore !== "audio"}>
+      <AudioInterface />
+    </div>
+  </div>
+</div>
+
+<style>
+  .tab-hidden {
+    display: none;
+  }
+</style>

ui-svelte/src/routes/PlaygroundStub.svelte

@@ -0,0 +1 @@
+<!-- empty: real Playground is always mounted in App.svelte -->

ui-svelte/src/stores/api.ts

@@ -1,5 +1,5 @@
 import { writable } from "svelte/store";
-import type { Model, Metrics, VersionInfo, LogData, APIEventEnvelope } from "../lib/types";
+import type { Model, Metrics, VersionInfo, LogData, APIEventEnvelope, ReqRespCapture, InFlightStats } from "../lib/types";
 import { connectionState } from "./theme";
 
 const LOG_LENGTH_LIMIT = 1024 * 100; /* 100KB of log data */
@@ -9,6 +9,7 @@ export const models = writable<Model[]>([]);
 export const proxyLogs = writable<string>("");
 export const upstreamLogs = writable<string>("");
 export const metrics = writable<Metrics[]>([]);
+export const inFlightRequests = writable<number>(0);
 export const versionInfo = writable<VersionInfo>({
   build_date: "unknown",
   commit: "unknown",
@@ -29,6 +30,7 @@ export function enableAPIEvents(enabled: boolean): void {
     apiEventSource?.close();
     apiEventSource = null;
     metrics.set([]);
+    inFlightRequests.set(0);
     return;
   }
 
@@ -46,6 +48,7 @@ export function enableAPIEvents(enabled: boolean): void {
       proxyLogs.set("");
       upstreamLogs.set("");
       metrics.set([]);
+      inFlightRequests.set(0);
       models.set([]);
       retryCount = 0;
       connectionState.set("connected");
@@ -83,6 +86,11 @@ export function enableAPIEvents(enabled: boolean): void {
             metrics.update((prevMetrics) => [...newMetrics, ...prevMetrics]);
             break;
           }
+          case "inflight": {
+            const stats = JSON.parse(message.data) as InFlightStats;
+            inFlightRequests.set(stats.total ?? 0);
+            break;
+          }
         }
       } catch (err) {
         console.error(e.data, err);
@@ -172,3 +180,19 @@ export async function loadModel(model: string): Promise<void> {
     throw error;
   }
 }
+
+export async function getCapture(id: number): Promise<ReqRespCapture | null> {
+  try {
+    const response = await fetch(`/api/captures/${id}`);
+    if (response.status === 404) {
+      return null;
+    }
+    if (!response.ok) {
+      throw new Error(`Failed to fetch capture: ${response.status}`);
+    }
+    return await response.json();
+  } catch (error) {
+    console.error("Failed to fetch capture:", error);
+    return null;
+  }
+}

ui-svelte/src/stores/playgroundActivity.ts

@@ -0,0 +1,18 @@
+import { writable, derived } from "svelte/store";
+
+const chatStreaming = writable(false);
+const imageGenerating = writable(false);
+const speechGenerating = writable(false);
+const audioTranscribing = writable(false);
+
+export const playgroundActivity = derived(
+  [chatStreaming, imageGenerating, speechGenerating, audioTranscribing],
+  ([$chat, $image, $speech, $audio]) => $chat || $image || $speech || $audio
+);
+
+export const playgroundStores = {
+  chatStreaming,
+  imageGenerating,
+  speechGenerating,
+  audioTranscribing,
+};

ui-svelte/src/stores/route.ts

@@ -0,0 +1,3 @@
+import { writable } from "svelte/store";
+
+export const currentRoute = writable("/");

ui-svelte/vite.config.ts

@@ -1,10 +1,25 @@
 import { defineConfig } from "vite";
 import { svelte } from "@sveltejs/vite-plugin-svelte";
 import tailwindcss from "@tailwindcss/vite";
+import { compression } from "vite-plugin-compression2";
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [svelte(), tailwindcss()],
+  plugins: [
+    svelte(),
+    tailwindcss(),
+    compression({
+      algorithm: "gzip",
+      exclude: [/\.(br)$/, /\.(gz)$/],
+      threshold: 1024,
+    }),
+    compression({
+      algorithm: "brotliCompress",
+      exclude: [/\.(br)$/, /\.(gz)$/],
+      threshold: 1024,
+      filename: "[path][base].br",
+    }),
+  ],
   base: "/ui/",
   build: {
     outDir: "../proxy/ui_dist",
@@ -16,6 +31,7 @@ export default defineConfig({
       "/logs": "http://localhost:8080",
       "/upstream": "http://localhost:8080",
       "/unload": "http://localhost:8080",
+      "/v1": "http://localhost:8080",
     },
   },
 });

ui/.gitignore

@@ -1,25 +0,0 @@
-.vite
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-lerna-debug.log*
-
-node_modules
-dist
-dist-ssr
-*.local
-
-# Editor directories and files
-.vscode/*
-!.vscode/extensions.json
-.idea
-.DS_Store
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?

ui/README.md

@@ -1,54 +0,0 @@
-# React + TypeScript + Vite
-
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
-
-Currently, two official plugins are available:
-
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
-
-```js
-export default tseslint.config({
-  extends: [
-    // Remove ...tseslint.configs.recommended and replace with this
-    ...tseslint.configs.recommendedTypeChecked,
-    // Alternatively, use this for stricter rules
-    ...tseslint.configs.strictTypeChecked,
-    // Optionally, add this for stylistic rules
-    ...tseslint.configs.stylisticTypeChecked,
-  ],
-  languageOptions: {
-    // other options...
-    parserOptions: {
-      project: ['./tsconfig.node.json', './tsconfig.app.json'],
-      tsconfigRootDir: import.meta.dirname,
-    },
-  },
-})
-```
-
-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
-
-```js
-// eslint.config.js
-import reactX from 'eslint-plugin-react-x'
-import reactDom from 'eslint-plugin-react-dom'
-
-export default tseslint.config({
-  plugins: {
-    // Add the react-x and react-dom plugins
-    'react-x': reactX,
-    'react-dom': reactDom,
-  },
-  rules: {
-    // other rules...
-    // Enable its recommended typescript rules
-    ...reactX.configs['recommended-typescript'].rules,
-    ...reactDom.configs.recommended.rules,
-  },
-})
-```

ui/eslint.config.js

@@ -1,28 +0,0 @@
-import js from '@eslint/js'
-import globals from 'globals'
-import reactHooks from 'eslint-plugin-react-hooks'
-import reactRefresh from 'eslint-plugin-react-refresh'
-import tseslint from 'typescript-eslint'
-
-export default tseslint.config(
-  { ignores: ['dist'] },
-  {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ['**/*.{ts,tsx}'],
-    languageOptions: {
-      ecmaVersion: 2020,
-      globals: globals.browser,
-    },
-    plugins: {
-      'react-hooks': reactHooks,
-      'react-refresh': reactRefresh,
-    },
-    rules: {
-      ...reactHooks.configs.recommended.rules,
-      'react-refresh/only-export-components': [
-        'warn',
-        { allowConstantExport: true },
-      ],
-    },
-  },
-)

ui/index.html

@@ -1,17 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96" />
-    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-    <link rel="shortcut icon" href="/favicon.ico" />
-    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
-    <link rel="manifest" href="/site.webmanifest" />
-    <title>llama-swap</title>
-  </head>
-  <body >
-    <div id="root"></div>
-    <script type="module" src="/src/main.tsx"></script>
-  </body>
-</html>

ui/package.json

@@ -1,34 +0,0 @@
-{
-  "name": "ui",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
-  "scripts": {
-    "start": "vite",
-    "build": "tsc -b && vite build --emptyOutDir",
-    "lint": "eslint .",
-    "preview": "vite preview"
-  },
-  "dependencies": {
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0",
-    "react-icons": "^5.5.0",
-    "react-resizable-panels": "^3.0.4",
-    "react-router-dom": "^7.12.0"
-  },
-  "devDependencies": {
-    "@eslint/js": "^9.25.0",
-    "@tailwindcss/vite": "^4.1.8",
-    "@types/react": "^19.1.2",
-    "@types/react-dom": "^19.1.2",
-    "@vitejs/plugin-react": "^4.4.1",
-    "eslint": "^9.25.0",
-    "eslint-plugin-react-hooks": "^5.2.0",
-    "eslint-plugin-react-refresh": "^0.4.19",
-    "globals": "^16.0.0",
-    "tailwindcss": "^4.1.8",
-    "typescript": "~5.8.3",
-    "typescript-eslint": "^8.30.1",
-    "vite": "^6.3.5"
-  }
-}

ui/public/site.webmanifest

@@ -1,21 +0,0 @@
-{
-  "name": "llama-swap",
-  "short_name": "llama-swap",
-  "icons": [
-    {
-      "src": "/web-app-manifest-192x192.png",
-      "sizes": "192x192",
-      "type": "image/png",
-      "purpose": "maskable"
-    },
-    {
-      "src": "/web-app-manifest-512x512.png",
-      "sizes": "512x512",
-      "type": "image/png",
-      "purpose": "maskable"
-    }
-  ],
-  "theme_color": "#ffffff",
-  "background_color": "#ffffff",
-  "display": "standalone"
-}

ui/src/App.css

@@ -1,6 +0,0 @@
-#root {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
-}

ui/src/App.tsx

@@ -1,38 +0,0 @@
-import { useEffect } from "react";
-import { Navigate, Route, BrowserRouter as Router, Routes } from "react-router-dom";
-import { Header } from "./components/Header";
-import { useAPI } from "./contexts/APIProvider";
-import { useTheme } from "./contexts/ThemeProvider";
-import ActivityPage from "./pages/Activity";
-import LogViewerPage from "./pages/LogViewer";
-import ModelPage from "./pages/Models";
-
-function App() {
-  const { setConnectionState } = useTheme();
-
-  const { connectionStatus } = useAPI();
-
-  // Synchronize the window.title connections state with the actual connection state
-  useEffect(() => {
-    setConnectionState(connectionStatus);
-  }, [connectionStatus]);
-
-  return (
-    <Router basename="/ui/">
-      <div className="flex flex-col h-screen">
-        <Header />
-
-        <main className="flex-1 overflow-auto p-4">
-          <Routes>
-            <Route path="/" element={<LogViewerPage />} />
-            <Route path="/models" element={<ModelPage />} />
-            <Route path="/activity" element={<ActivityPage />} />
-            <Route path="*" element={<Navigate to="/" replace />} />
-          </Routes>
-        </main>
-      </div>
-    </Router>
-  );
-}
-
-export default App;

ui/src/assets/react.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

ui/src/components/ConnectionStatus.tsx

@@ -1,26 +0,0 @@
-import { useAPI } from "../contexts/APIProvider";
-import { useMemo } from "react";
-
-const ConnectionStatusIcon = () => {
-  const { connectionStatus, versionInfo } = useAPI();
-
-  const eventStatusColor = useMemo(() => {
-    switch (connectionStatus) {
-      case "connected":
-        return "bg-emerald-500";
-      case "connecting":
-        return "bg-amber-500";
-      case "disconnected":
-      default:
-        return "bg-red-500";
-    }
-  }, [connectionStatus]);
-
-  return (
-    <div className="flex items-center" title={`Event Stream: ${connectionStatus ?? 'unknown'}\nAPI Version: ${versionInfo?.version ?? 'unknown'}\nCommit Hash: ${versionInfo?.commit?.substring(0,7) ?? 'unknown'}\nBuild Date: ${versionInfo?.build_date ?? 'unknown'}`}>
-      <span className={`inline-block w-3 h-3 rounded-full ${eventStatusColor} mr-2`}></span>
-    </div>
-  );
-};
-
-export default ConnectionStatusIcon;

ui/src/components/Header.tsx

@@ -1,56 +0,0 @@
-import { useCallback } from "react";
-import { RiMoonFill, RiSunFill } from "react-icons/ri";
-import { NavLink, type NavLinkRenderProps } from "react-router-dom";
-import { useTheme } from "../contexts/ThemeProvider";
-import ConnectionStatusIcon from "./ConnectionStatus";
-
-export function Header() {
-  const { screenWidth, toggleTheme, isDarkMode, appTitle, setAppTitle, isNarrow } = useTheme();
-  const handleTitleChange = useCallback(
-    (newTitle: string) => {
-      setAppTitle(newTitle.replace(/\n/g, "").trim().substring(0, 64) || "llama-swap");
-    },
-    [setAppTitle]
-  );
-
-  const navLinkClass = ({ isActive }: NavLinkRenderProps) =>
-    `text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1 ${isActive ? "font-semibold" : ""}`;
-
-  return (
-    <header className={`flex items-center justify-between bg-surface border-b border-border px-4 ${isNarrow ? "py-1 h-[60px]" : "p-2 h-[75px]"}`}>
-      {screenWidth !== "xs" && screenWidth !== "sm" && (
-        <h1
-          contentEditable
-          suppressContentEditableWarning
-          className="p-0 outline-none hover:bg-gray-100 dark:hover:bg-gray-700 rounded"
-          onBlur={(e) => handleTitleChange(e.currentTarget.textContent || "(set title)")}
-          onKeyDown={(e) => {
-            if (e.key === "Enter") {
-              e.preventDefault();
-              handleTitleChange(e.currentTarget.textContent || "(set title)");
-              e.currentTarget.blur();
-            }
-          }}
-        >
-          {appTitle}
-        </h1>
-      )}
-
-      <menu className="flex items-center gap-4">
-        <NavLink to="/" className={navLinkClass} type="button">
-          Logs
-        </NavLink>
-        <NavLink to="/models" className={navLinkClass} type="button">
-          Models
-        </NavLink>
-        <NavLink to="/activity" className={navLinkClass} type="button">
-          Activity
-        </NavLink>
-        <button className="" onClick={toggleTheme}>
-          {isDarkMode ? <RiMoonFill /> : <RiSunFill />}
-        </button>
-        <ConnectionStatusIcon />
-      </menu>
-    </header>
-  );
-}

ui/src/contexts/APIProvider.tsx

@@ -1,293 +0,0 @@
-import { createContext, useState, useContext, useEffect, useCallback, useMemo, type ReactNode } from "react";
-import type { ConnectionState } from "../lib/types";
-
-type ModelStatus = "ready" | "starting" | "stopping" | "stopped" | "shutdown" | "unknown";
-const LOG_LENGTH_LIMIT = 1024 * 100; /* 100KB of log data */
-
-export interface Model {
-  id: string;
-  state: ModelStatus;
-  name: string;
-  description: string;
-  unlisted: boolean;
-  peerID: string;
-}
-
-interface APIProviderType {
-  models: Model[];
-  listModels: () => Promise<Model[]>;
-  unloadAllModels: () => Promise<void>;
-  unloadSingleModel: (model: string) => Promise<void>;
-  loadModel: (model: string) => Promise<void>;
-  enableAPIEvents: (enabled: boolean) => void;
-  proxyLogs: string;
-  upstreamLogs: string;
-  metrics: Metrics[];
-  connectionStatus: ConnectionState;
-  versionInfo: VersionInfo;
-}
-
-interface Metrics {
-  id: number;
-  timestamp: string;
-  model: string;
-  cache_tokens: number;
-  input_tokens: number;
-  output_tokens: number;
-  prompt_per_second: number;
-  tokens_per_second: number;
-  duration_ms: number;
-}
-
-interface LogData {
-  source: "upstream" | "proxy";
-  data: string;
-}
-
-interface APIEventEnvelope {
-  type: "modelStatus" | "logData" | "metrics";
-  data: string;
-}
-
-interface VersionInfo {
-  build_date: string;
-  commit: string;
-  version: string;
-}
-
-const APIContext = createContext<APIProviderType | undefined>(undefined);
-type APIProviderProps = {
-  children: ReactNode;
-  autoStartAPIEvents?: boolean;
-};
-
-let apiEventSource: EventSource | null = null;
-
-export function APIProvider({ children, autoStartAPIEvents = true }: APIProviderProps) {
-  const [proxyLogs, setProxyLogs] = useState("");
-  const [upstreamLogs, setUpstreamLogs] = useState("");
-  const [metrics, setMetrics] = useState<Metrics[]>([]);
-  const [connectionStatus, setConnectionState] = useState<ConnectionState>("disconnected");
-  const [versionInfo, setVersionInfo] = useState<VersionInfo>({
-    build_date: "unknown",
-    commit: "unknown",
-    version: "unknown",
-  });
-  //const apiEventSource = useRef<EventSource | null>(null);
-
-  const [models, setModels] = useState<Model[]>([]);
-
-  const appendLog = useCallback((newData: string, setter: React.Dispatch<React.SetStateAction<string>>) => {
-    setter((prev) => {
-      const updatedLog = prev + newData;
-      return updatedLog.length > LOG_LENGTH_LIMIT ? updatedLog.slice(-LOG_LENGTH_LIMIT) : updatedLog;
-    });
-  }, []);
-
-  const enableAPIEvents = useCallback((enabled: boolean) => {
-    if (!enabled) {
-      apiEventSource?.close();
-      apiEventSource = null;
-      setMetrics([]);
-      return;
-    }
-
-    let retryCount = 0;
-    const initialDelay = 1000; // 1 second
-
-    const connect = () => {
-      apiEventSource?.close();
-      apiEventSource = new EventSource("/api/events");
-
-      setConnectionState("connecting");
-
-      apiEventSource.onopen = () => {
-        // clear everything out on connect to keep things in sync
-        setProxyLogs("");
-        setUpstreamLogs("");
-        setMetrics([]); // clear metrics on reconnect
-        setModels([]); // clear models on reconnect
-        retryCount = 0;
-        setConnectionState("connected");
-      };
-
-      apiEventSource.onmessage = (e: MessageEvent) => {
-        try {
-          const message = JSON.parse(e.data) as APIEventEnvelope;
-          switch (message.type) {
-            case "modelStatus":
-              {
-                const models = JSON.parse(message.data) as Model[];
-
-                // sort models by name and id
-                models.sort((a, b) => {
-                  return (a.name + a.id).localeCompare(b.name + b.id);
-                });
-
-                setModels(models);
-              }
-              break;
-
-            case "logData":
-              const logData = JSON.parse(message.data) as LogData;
-              switch (logData.source) {
-                case "proxy":
-                  appendLog(logData.data, setProxyLogs);
-                  break;
-                case "upstream":
-                  appendLog(logData.data, setUpstreamLogs);
-                  break;
-              }
-              break;
-
-            case "metrics":
-              {
-                const newMetrics = JSON.parse(message.data) as Metrics[];
-                setMetrics((prevMetrics) => {
-                  return [...newMetrics, ...prevMetrics];
-                });
-              }
-              break;
-          }
-        } catch (err) {
-          console.error(e.data, err);
-        }
-      };
-
-      apiEventSource.onerror = () => {
-        apiEventSource?.close();
-        retryCount++;
-        const delay = Math.min(initialDelay * Math.pow(2, retryCount - 1), 5000);
-        setConnectionState("disconnected");
-        setTimeout(connect, delay);
-      };
-    };
-
-    connect();
-  }, []);
-
-  useEffect(() => {
-    // fetch version
-    const fetchVersion = async () => {
-      try {
-        const response = await fetch("/api/version");
-        if (!response.ok) {
-          throw new Error(`HTTP error! status: ${response.status}`);
-        }
-        const data: VersionInfo = await response.json();
-        setVersionInfo(data);
-      } catch (error) {
-        console.error(error);
-      }
-    };
-
-    if (connectionStatus === "connected") {
-      fetchVersion();
-    }
-  }, [connectionStatus]);
-
-  useEffect(() => {
-    if (autoStartAPIEvents) {
-      enableAPIEvents(true);
-    }
-
-    return () => {
-      enableAPIEvents(false);
-    };
-  }, [enableAPIEvents, autoStartAPIEvents]);
-
-  const listModels = useCallback(async (): Promise<Model[]> => {
-    try {
-      const response = await fetch("/api/models/");
-      if (!response.ok) {
-        throw new Error(`HTTP error! status: ${response.status}`);
-      }
-      const data = await response.json();
-      return data || [];
-    } catch (error) {
-      console.error("Failed to fetch models:", error);
-      return []; // Return empty array as fallback
-    }
-  }, []);
-
-  const unloadAllModels = useCallback(async () => {
-    try {
-      const response = await fetch(`/api/models/unload`, {
-        method: "POST",
-      });
-      if (!response.ok) {
-        throw new Error(`Failed to unload models: ${response.status}`);
-      }
-    } catch (error) {
-      console.error("Failed to unload models:", error);
-      throw error; // Re-throw to let calling code handle it
-    }
-  }, []);
-
-  const unloadSingleModel = useCallback(async (model: string) => {
-    try {
-      const response = await fetch(`/api/models/unload/${model}`, {
-        method: "POST",
-      });
-      if (!response.ok) {
-        throw new Error(`Failed to unload model: ${response.status}`);
-      }
-    } catch (error) {
-      console.error("Failed to unload model", model, error);
-      throw error;
-    }
-  }, []);
-
-  const loadModel = useCallback(async (model: string) => {
-    try {
-      const response = await fetch(`/upstream/${model}/`, {
-        method: "GET",
-      });
-      if (!response.ok) {
-        throw new Error(`Failed to load model: ${response.status}`);
-      }
-    } catch (error) {
-      console.error("Failed to load model:", error);
-      throw error; // Re-throw to let calling code handle it
-    }
-  }, []);
-
-  const value = useMemo(
-    () => ({
-      models,
-      listModels,
-      unloadAllModels,
-      unloadSingleModel,
-      loadModel,
-      enableAPIEvents,
-      proxyLogs,
-      upstreamLogs,
-      metrics,
-      connectionStatus,
-      versionInfo,
-    }),
-    [
-      models,
-      listModels,
-      unloadAllModels,
-      unloadSingleModel,
-      loadModel,
-      enableAPIEvents,
-      proxyLogs,
-      upstreamLogs,
-      metrics,
-      connectionStatus,
-      versionInfo,
-    ]
-  );
-
-  return <APIContext.Provider value={value}>{children}</APIContext.Provider>;
-}
-
-export function useAPI() {
-  const context = useContext(APIContext);
-  if (context === undefined) {
-    throw new Error("useAPI must be used within an APIProvider");
-  }
-  return context;
-}

ui/src/contexts/ThemeProvider.tsx

@@ -1,97 +0,0 @@
-import { createContext, useContext, useEffect, type ReactNode, useMemo, useState } from "react";
-import { usePersistentState } from "../hooks/usePersistentState";
-import type { ConnectionState } from "../lib/types";
-
-type ScreenWidth = "xs" | "sm" | "md" | "lg" | "xl" | "2xl";
-type ThemeContextType = {
-  isDarkMode: boolean;
-  screenWidth: ScreenWidth;
-  isNarrow: boolean;
-  toggleTheme: () => void;
-
-  // for managing the window title and connection state information
-  appTitle: string;
-  setAppTitle: (title: string) => void;
-  setConnectionState: (state: ConnectionState) => void;
-};
-
-const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
-
-type ThemeProviderProps = {
-  children: ReactNode;
-};
-
-export function ThemeProvider({ children }: ThemeProviderProps) {
-  const [appTitle, setAppTitle] = usePersistentState("app-title", "llama-swap");
-  const [connectionState, setConnectionState] = useState<ConnectionState>("disconnected");
-
-  /**
-   * Set the document.title with informative information
-   */
-  useEffect(() => {
-    const connectionIcon = connectionState === "connecting" ? "🟡" : connectionState === "connected" ? "🟢" : "🔴";
-    document.title = connectionIcon + " " + appTitle; // Set initial title
-  }, [appTitle, connectionState]);
-
-  const [isDarkMode, setIsDarkMode] = usePersistentState<boolean>("theme", false);
-  const [screenWidth, setScreenWidth] = useState<ScreenWidth>("md"); // Default to md
-
-  // matches tailwind classes
-  // https://tailwindcss.com/docs/responsive-design
-  useEffect(() => {
-    const checkInnerWidth = () => {
-      const innerWidth = window.innerWidth;
-      if (innerWidth < 640) {
-        setScreenWidth("xs");
-      } else if (innerWidth < 768) {
-        setScreenWidth("sm");
-      } else if (innerWidth < 1024) {
-        setScreenWidth("md");
-      } else if (innerWidth < 1280) {
-        setScreenWidth("lg");
-      } else if (innerWidth < 1536) {
-        setScreenWidth("xl");
-      } else {
-        setScreenWidth("2xl");
-      }
-    };
-
-    checkInnerWidth();
-    window.addEventListener("resize", checkInnerWidth);
-
-    return () => window.removeEventListener("resize", checkInnerWidth);
-  }, []);
-
-  useEffect(() => {
-    document.documentElement.setAttribute("data-theme", isDarkMode ? "dark" : "light");
-  }, [isDarkMode]);
-
-  const toggleTheme = () => setIsDarkMode((prev) => !prev);
-  const isNarrow = useMemo(() => {
-    return screenWidth === "xs" || screenWidth === "sm" || screenWidth === "md";
-  }, [screenWidth]);
-
-  return (
-    <ThemeContext.Provider
-      value={{
-        isDarkMode,
-        toggleTheme,
-        screenWidth,
-        isNarrow,
-        appTitle,
-        setAppTitle,
-        setConnectionState,
-      }}
-    >
-      {children}
-    </ThemeContext.Provider>
-  );
-}
-
-export function useTheme(): ThemeContextType {
-  const context = useContext(ThemeContext);
-  if (context === undefined) {
-    throw new Error("useTheme must be used within a ThemeProvider");
-  }
-  return context;
-}

ui/src/hooks/usePersistentState.ts

@@ -1,39 +0,0 @@
-import { useState, useEffect, useCallback } from "react";
-
-export function usePersistentState<T>(key: string, initialValue: T): [T, (value: T | ((prevState: T) => T)) => void] {
-  const [state, setState] = useState<T>(() => {
-    if (typeof window === "undefined") return initialValue;
-    try {
-      const saved = localStorage.getItem(key);
-      return saved !== null ? JSON.parse(saved) : initialValue;
-    } catch (e) {
-      console.error(`Error parsing stored value for ${key}`, e);
-      return initialValue;
-    }
-  });
-
-  const setPersistentState = useCallback(
-    (value: T | ((prevState: T) => T)) => {
-      setState((prev) => {
-        const nextValue = typeof value === "function" ? (value as (prevState: T) => T)(prev) : value;
-        try {
-          localStorage.setItem(key, JSON.stringify(nextValue));
-        } catch (e) {
-          console.error(`Error saving value for ${key}`, e);
-        }
-        return nextValue;
-      });
-    },
-    [key]
-  );
-
-  useEffect(() => {
-    try {
-      localStorage.setItem(key, JSON.stringify(state));
-    } catch (e) {
-      console.error(`Error saving value for ${key}`, e);
-    }
-  }, [key, state]);
-
-  return [state, setPersistentState];
-}

ui/src/index.css

@@ -1,176 +0,0 @@
-@import "tailwindcss";
-@custom-variant dark (&:where([data-theme=dark], [data-theme=dark] *));
-
-@theme {
-  --color-background: rgba(252, 252, 249, 1);
-  --color-surface: rgba(255, 255, 253, 1);
-
-  /* text colors */
-  --color-txtmain: rgba(19, 52, 59, 1);
-  --color-txtsecondary: rgba(98, 108, 113, 1);
-  --color-navlink-active: rgba(245, 245, 245, 1);
-
-  --color-primary: rgba(50, 184, 198, 1);
-
-  --color-primary-hover: rgba(29, 116, 128, 1);
-  --color-primary-active: rgba(26, 104, 115, 1);
-  --color-secondary: rgba(94, 82, 64, 0.12);
-  --color-secondary-hover: rgba(94, 82, 64, 0.2);
-  --color-secondary-active: rgba(94, 82, 64, 0.25);
-  --color-border: rgba(94, 82, 64, 0.3);
-  --color-btn-primary-text: rgba(252, 252, 249, 1);
-  --color-card-border: rgba(94, 82, 64, 0.12);
-  --color-card-border-inner: rgba(94, 82, 64, 0.12);
-  --color-error: rgba(192, 21, 47, 1);
-  --color-success: rgba(33, 128, 141, 1);
-  --color-warning: rgb(244, 155, 0);
-  --color-info: rgba(98, 108, 113, 1);
-  --color-focus-ring: rgba(33, 128, 141, 0.4);
-  --color-select-caret: rgba(19, 52, 59, 0.8);
-  --color-btn-border: rgba(94, 82, 64, 0.7);
-}
-
-@layer theme {
-  /* over ride theme for dark mode */
-  [data-theme="dark"] {
-    --color-background: rgba(31, 33, 33, 1);
-    --color-surface: rgba(38, 40, 40, 1);
-    /* text colors */
-    --color-txtmain: rgba(245, 245, 245, 1);
-    --color-txtsecondary: rgba(167, 169, 169, 0.7);
-
-    --color-navlink-active: rgba(245, 245, 245, 1);
-
-    --color-primary: rgba(33, 128, 141, 1);
-    --color-primary-hover: rgba(45, 166, 178, 1);
-    --color-primary-active: rgba(41, 150, 161, 1);
-    --color-secondary: rgba(119, 124, 124, 0.15);
-    --color-secondary-hover: rgba(119, 124, 124, 0.25);
-    --color-secondary-active: rgba(119, 124, 124, 0.3);
-    --color-border: rgba(119, 124, 124, 0.3);
-    --color-error: rgba(255, 84, 89, 1);
-    --color-success: rgba(50, 184, 198, 1);
-    --color-warning: rgb(244, 155, 0);
-    --color-info: rgba(167, 169, 169, 1);
-    --color-focus-ring: rgba(50, 184, 198, 0.4);
-    --color-btn-primary-text: rgba(19, 52, 59, 1);
-    --color-card-border: rgba(119, 124, 124, 0.2);
-    --color-card-border-inner: rgba(119, 124, 124, 0.15);
-    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1), inset 0 -1px 0 rgba(0, 0, 0, 0.15);
-    --button-border-secondary: rgba(119, 124, 124, 0.2);
-  }
-}
-
-@layer base {
-  body {
-    /* example of how colors using theme colors*/
-    @apply bg-background text-txtmain;
-  }
-
-  h1 {
-    @apply text-4xl text-txtmain font-bold pb-4;
-  }
-  h2 {
-    @apply text-3xl text-txtmain font-bold pb-4;
-  }
-  h3 {
-    @apply text-2xl text-txtmain font-bold pb-4;
-  }
-  h4 {
-    @apply text-xl text-txtmain font-bold pb-4;
-  }
-  h5 {
-    @apply text-lg text-txtmain font-bold pb-4;
-  }
-  h6 {
-    @apply text-base text-txtmain font-bold pb-4;
-  }
-}
-
-/* define CSS classes here for specific types of components */
-@layer components {
-  .container {
-    @apply px-4;
-  }
-
-  /* Tables */
-  table th {
-    @apply p-2 font-semibold;
-  }
-  table td {
-    @apply p-2;
-  }
-
-  /* Navigation Header */
-
-  .navlink {
-    @apply text-txtsecondary hover:bg-secondary hover:text-txtmain rounded-lg p-2;
-  }
-  .navlink.active {
-    @apply bg-primary text-navlink-active;
-  }
-
-  /* Card component */
-  .card {
-    @apply bg-surface rounded-lg border border-card-border shadow-sm overflow-hidden p-4;
-  }
-
-  .card:hover {
-    @apply shadow-md;
-  }
-
-  .card__body {
-    @apply p-4;
-  }
-
-  .card__header,
-  .card__footer {
-    @apply p-4 border-b border-card-border-inner;
-  }
-
-  /* Status Badges */
-  .status {
-    @apply inline-block px-2 py-1 text-xs font-medium rounded-lg;
-  }
-
-  .status--ready {
-    @apply bg-success/10 text-success;
-  }
-
-  .status--starting,
-  .status--stopping {
-    @apply bg-warning/10 text-warning;
-  }
-
-  .status--stopped {
-    @apply bg-error/10 text-error;
-  }
-
-  /* Buttons */
-  .btn {
-    @apply bg-surface py-2 px-4 text-sm rounded-md border transition-colors duration-200 border-btn-border;
-  }
-
-  .btn:hover {
-    cursor: pointer;
-  }
-
-  .btn--sm {
-    @apply px-2 py-0.5 text-xs;
-  }
-
-  .btn:disabled {
-    @apply opacity-50 cursor-not-allowed;
-  }
-}
-
-@layer utilities {
-  .ml-2 {
-    margin-left: 0.5rem;
-  }
-
-  .my-8 {
-    margin-top: 2rem;
-    margin-bottom: 2rem;
-  }
-}

ui/src/lib/types.ts

@@ -1 +0,0 @@
-export type ConnectionState = "connected" | "connecting" | "disconnected";

ui/src/main.tsx

@@ -1,16 +0,0 @@
-import { StrictMode } from "react";
-import { createRoot } from "react-dom/client";
-import "./index.css";
-import App from "./App.tsx";
-import { ThemeProvider } from "./contexts/ThemeProvider";
-import { APIProvider } from "./contexts/APIProvider";
-
-createRoot(document.getElementById("root")!).render(
-  <StrictMode>
-    <ThemeProvider>
-      <APIProvider>
-        <App />
-      </APIProvider>
-    </ThemeProvider>
-  </StrictMode>
-);

ui/src/pages/Activity.tsx

@@ -1,120 +0,0 @@
-import { useMemo } from "react";
-import { useAPI } from "../contexts/APIProvider";
-
-const formatSpeed = (speed: number): string => {
-  return speed < 0 ? "unknown" : speed.toFixed(2) + " t/s";
-};
-
-const formatDuration = (ms: number): string => {
-  return (ms / 1000).toFixed(2) + "s";
-};
-
-const formatRelativeTime = (timestamp: string): string => {
-  const now = new Date();
-  const date = new Date(timestamp);
-  const diffInSeconds = Math.floor((now.getTime() - date.getTime()) / 1000);
-
-  // Handle future dates by returning "just now"
-  if (diffInSeconds < 5) {
-    return "now";
-  }
-
-  if (diffInSeconds < 60) {
-    return `${diffInSeconds}s ago`;
-  }
-
-  const diffInMinutes = Math.floor(diffInSeconds / 60);
-  if (diffInMinutes < 60) {
-    return `${diffInMinutes}m ago`;
-  }
-
-  const diffInHours = Math.floor(diffInMinutes / 60);
-  if (diffInHours < 24) {
-    return `${diffInHours}h ago`;
-  }
-
-  return "a while ago";
-};
-
-const ActivityPage = () => {
-  const { metrics } = useAPI();
-  const sortedMetrics = useMemo(() => {
-    return [...metrics].sort((a, b) => b.id - a.id);
-  }, [metrics]);
-
-  return (
-    <div className="p-2">
-      <h1 className="text-2xl font-bold">Activity</h1>
-
-      {metrics.length === 0 && (
-        <div className="text-center py-8">
-          <p className="text-gray-600">No metrics data available</p>
-        </div>
-      )}
-      {metrics.length > 0 && (
-        <div className="card overflow-auto">
-          <table className="min-w-full divide-y">
-            <thead className="border-gray-200 dark:border-white/10">
-              <tr className="text-left text-xs uppercase tracking-wider">
-                <th className="px-6 py-3">ID</th>
-                <th className="px-6 py-3">Time</th>
-                <th className="px-6 py-3">Model</th>
-                <th className="px-6 py-3">
-                  Cached <Tooltip content="prompt tokens from cache" />
-                </th>
-                <th className="px-6 py-3">
-                  Prompt <Tooltip content="new prompt tokens processed" />
-                </th>
-                <th className="px-6 py-3">Generated</th>
-                <th className="px-6 py-3">Prompt Processing</th>
-                <th className="px-6 py-3">Generation Speed</th>
-                <th className="px-6 py-3">Duration</th>
-              </tr>
-            </thead>
-            <tbody className="divide-y">
-              {sortedMetrics.map((metric) => (
-                <tr key={metric.id} className="whitespace-nowrap text-sm border-gray-200 dark:border-white/10">
-                  <td className="px-4 py-4">{metric.id + 1 /* un-zero index */}</td>
-                  <td className="px-6 py-4">{formatRelativeTime(metric.timestamp)}</td>
-                  <td className="px-6 py-4">{metric.model}</td>
-                  <td className="px-6 py-4">{metric.cache_tokens > 0 ? metric.cache_tokens.toLocaleString() : "-"}</td>
-                  <td className="px-6 py-4">{metric.input_tokens.toLocaleString()}</td>
-                  <td className="px-6 py-4">{metric.output_tokens.toLocaleString()}</td>
-                  <td className="px-6 py-4">{formatSpeed(metric.prompt_per_second)}</td>
-                  <td className="px-6 py-4">{formatSpeed(metric.tokens_per_second)}</td>
-                  <td className="px-6 py-4">{formatDuration(metric.duration_ms)}</td>
-                </tr>
-              ))}
-            </tbody>
-          </table>
-        </div>
-      )}
-    </div>
-  );
-};
-
-interface TooltipProps {
-  content: string;
-}
-
-const Tooltip: React.FC<TooltipProps> = ({ content }) => {
-  return (
-    <div className="relative group inline-block">
-      ⓘ
-      <div
-        className="absolute top-full left-1/2 transform -translate-x-1/2 mt-2
-                     px-3 py-2 bg-gray-900 text-white text-sm rounded-md
-                     opacity-0 group-hover:opacity-100 transition-opacity
-                     duration-200 pointer-events-none whitespace-nowrap z-50 normal-case"
-      >
-        {content}
-        <div
-          className="absolute bottom-full left-1/2 transform -translate-x-1/2
-                       border-4 border-transparent border-b-gray-900"
-        ></div>
-      </div>
-    </div>
-  );
-};
-
-export default ActivityPage;

ui/src/pages/LogViewer.tsx

@@ -1,162 +0,0 @@
-import { useState, useEffect, useRef, useMemo, useCallback } from "react";
-import { useAPI } from "../contexts/APIProvider";
-import { usePersistentState } from "../hooks/usePersistentState";
-import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels";
-import {
-  RiTextWrap,
-  RiAlignJustify,
-  RiFontSize,
-  RiMenuSearchLine,
-  RiMenuSearchFill,
-  RiCloseCircleFill,
-} from "react-icons/ri";
-import { useTheme } from "../contexts/ThemeProvider";
-
-const LogViewer = () => {
-  const { proxyLogs, upstreamLogs } = useAPI();
-  const { screenWidth } = useTheme();
-  const direction = screenWidth === "xs" || screenWidth === "sm" ? "vertical" : "horizontal";
-
-  return (
-    <PanelGroup direction={direction} className="gap-2" autoSaveId="logviewer-panel-group">
-      <Panel id="proxy" defaultSize={50} minSize={5} maxSize={100} collapsible={true}>
-        <LogPanel id="proxy" title="Proxy Logs" logData={proxyLogs} />
-      </Panel>
-      <PanelResizeHandle
-        className={
-          direction === "horizontal"
-            ? "w-2 h-full bg-primary hover:bg-success transition-colors rounded"
-            : "w-full h-2 bg-primary hover:bg-success transition-colors rounded"
-        }
-      />
-      <Panel id="upstream" defaultSize={50} minSize={5} maxSize={100} collapsible={true}>
-        <LogPanel id="upstream" title="Upstream Logs" logData={upstreamLogs} />
-      </Panel>
-    </PanelGroup>
-  );
-};
-
-interface LogPanelProps {
-  id: string;
-  title: string;
-  logData: string;
-}
-export const LogPanel = ({ id, title, logData }: LogPanelProps) => {
-  const [filterRegex, setFilterRegex] = useState("");
-  const [fontSize, setFontSize] = usePersistentState<"xxs" | "xs" | "small" | "normal">(
-    `logPanel-${id}-fontSize`,
-    "normal"
-  );
-  const [wrapText, setTextWrap] = usePersistentState(`logPanel-${id}-wrapText`, false);
-  const [showFilter, setShowFilter] = usePersistentState(`logPanel-${id}-showFilter`, false);
-
-  const textWrapClass = useMemo(() => {
-    return wrapText ? "whitespace-pre-wrap" : "whitespace-pre";
-  }, [wrapText]);
-
-  const toggleFontSize = useCallback(() => {
-    setFontSize((prev) => {
-      switch (prev) {
-        case "xxs":
-          return "xs";
-        case "xs":
-          return "small";
-        case "small":
-          return "normal";
-        case "normal":
-          return "xxs";
-      }
-    });
-  }, []);
-
-  const toggleWrapText = useCallback(() => {
-    setTextWrap((prev) => !prev);
-  }, []);
-
-  const toggleFilter = useCallback(() => {
-    if (showFilter) {
-      setShowFilter(false);
-      setFilterRegex(""); // Clear filter when closing
-    } else {
-      setShowFilter(true);
-    }
-  }, [filterRegex, setFilterRegex, showFilter]);
-
-  const fontSizeClass = useMemo(() => {
-    switch (fontSize) {
-      case "xxs":
-        return "text-[0.5rem]"; // 0.5rem (8px)
-      case "xs":
-        return "text-[0.75rem]"; // 0.75rem (12px)
-      case "small":
-        return "text-[0.875rem]"; // 0.875rem (14px)
-      case "normal":
-        return "text-base"; // 1rem (16px)
-    }
-  }, [fontSize]);
-
-  const filteredLogs = useMemo(() => {
-    if (!filterRegex) return logData;
-    try {
-      const regex = new RegExp(filterRegex, "i");
-      const lines = logData.split("\n");
-      const filtered = lines.filter((line) => regex.test(line));
-      return filtered.join("\n");
-    } catch (e) {
-      return logData; // Return unfiltered if regex is invalid
-    }
-  }, [logData, filterRegex]);
-
-  // auto scroll to bottom
-  const preTagRef = useRef<HTMLPreElement>(null);
-  useEffect(() => {
-    if (!preTagRef.current) return;
-    preTagRef.current.scrollTop = preTagRef.current.scrollHeight;
-  }, [filteredLogs]);
-
-  return (
-    <div className="rounded-lg overflow-hidden flex flex-col bg-gray-950/5 dark:bg-white/10 h-full p-1">
-      <div className="p-4">
-        <div className="flex items-center justify-between">
-          <h3 className="m-0 text-lg p-0">{title}</h3>
-
-          <div className="flex gap-2 items-center">
-            <button className="btn border-0" onClick={toggleFontSize}>
-              <RiFontSize />
-            </button>
-            <button className="btn border-0" onClick={toggleWrapText}>
-              {wrapText ? <RiTextWrap /> : <RiAlignJustify />}
-            </button>
-            <button className="btn border-0" onClick={toggleFilter}>
-              {showFilter ? <RiMenuSearchFill /> : <RiMenuSearchLine />}
-            </button>
-          </div>
-        </div>
-
-        {/* Filtering Options - Full width on mobile, normal on desktop */}
-        {showFilter && (
-          <div className="mt-2 w-full">
-            <div className="flex gap-2 items-center w-full">
-              <input
-                type="text"
-                className="w-full text-sm border border-gray-950/10 dark:border-white/5 p-2 rounded outline-none"
-                placeholder="Filter logs..."
-                value={filterRegex}
-                onChange={(e) => setFilterRegex(e.target.value)}
-              />
-              <button className="pl-2" onClick={() => setFilterRegex("")}>
-                <RiCloseCircleFill size="24" />
-              </button>
-            </div>
-          </div>
-        )}
-      </div>
-      <div className="rounded-lg bg-background font-mono text-sm flex-1 overflow-hidden">
-        <pre ref={preTagRef} className={`${textWrapClass} ${fontSizeClass} h-full overflow-auto p-4`}>
-          {filteredLogs}
-        </pre>
-      </div>
-    </div>
-  );
-};
-export default LogViewer;

ui/src/pages/Models.tsx

@@ -1,527 +0,0 @@
-import { useState, useCallback, useMemo } from "react";
-import { useAPI } from "../contexts/APIProvider";
-import { LogPanel } from "./LogViewer";
-import { usePersistentState } from "../hooks/usePersistentState";
-import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels";
-import { useTheme } from "../contexts/ThemeProvider";
-import { RiEyeFill, RiEyeOffFill, RiSwapBoxFill, RiEjectLine, RiMenuFill } from "react-icons/ri";
-
-export default function ModelsPage() {
-  const { isNarrow } = useTheme();
-  const direction = isNarrow ? "vertical" : "horizontal";
-  const { upstreamLogs } = useAPI();
-
-  return (
-    <PanelGroup direction={direction} className="gap-2" autoSaveId={"models-panel-group"}>
-      <Panel id="models" defaultSize={50} minSize={isNarrow ? 0 : 25} maxSize={100} collapsible={isNarrow}>
-        <ModelsPanel />
-      </Panel>
-
-      <PanelResizeHandle
-        className={
-          direction === "horizontal"
-            ? "w-2 h-full bg-primary hover:bg-success transition-colors rounded"
-            : "w-full h-2 bg-primary hover:bg-success transition-colors rounded"
-        }
-      />
-      <Panel collapsible={true} defaultSize={50} minSize={0}>
-        <div className="flex flex-col h-full space-y-4">
-          {direction === "horizontal" && <StatsPanel />}
-          <div className="flex-1 min-h-0">
-            <LogPanel id="modelsupstream" title="Upstream Logs" logData={upstreamLogs} />
-          </div>
-        </div>
-      </Panel>
-    </PanelGroup>
-  );
-}
-
-function ModelsPanel() {
-  const { models, loadModel, unloadAllModels, unloadSingleModel } = useAPI();
-  const { isNarrow } = useTheme();
-  const [isUnloading, setIsUnloading] = useState(false);
-  const [showUnlisted, setShowUnlisted] = usePersistentState("showUnlisted", true);
-  const [showIdorName, setShowIdorName] = usePersistentState<"id" | "name">("showIdorName", "id"); // true = show ID, false = show name
-  const [menuOpen, setMenuOpen] = useState(false);
-
-  const { regularModels, peerModelsByPeerId } = useMemo(() => {
-    const filtered = models.filter((model) => showUnlisted || !model.unlisted);
-    const peerModels = filtered.filter((m) => m.peerID);
-
-    // Group peer models by peerID
-    const grouped = peerModels.reduce((acc, model) => {
-      const peerId = model.peerID || "unknown";
-      if (!acc[peerId]) {
-        acc[peerId] = [];
-      }
-      acc[peerId].push(model);
-      return acc;
-    }, {} as Record<string, typeof peerModels>);
-
-    return {
-      regularModels: filtered.filter((m) => !m.peerID),
-      peerModelsByPeerId: grouped,
-    };
-  }, [models, showUnlisted]);
-
-  const handleUnloadAllModels = useCallback(async () => {
-    setIsUnloading(true);
-    try {
-      await unloadAllModels();
-    } catch (e) {
-      console.error(e);
-    } finally {
-      setTimeout(() => {
-        setIsUnloading(false);
-      }, 1000);
-    }
-  }, [unloadAllModels]);
-
-  const toggleIdorName = useCallback(() => {
-    setShowIdorName((prev) => (prev === "name" ? "id" : "name"));
-  }, [showIdorName]);
-
-  return (
-    <div className="card h-full flex flex-col">
-      <div className="shrink-0">
-        <div className="flex justify-between items-baseline">
-          <h2 className={isNarrow ? "text-xl" : ""}>Models</h2>
-          {isNarrow && (
-            <div className="relative">
-              <button className="btn text-base flex items-center gap-2 py-1" onClick={() => setMenuOpen(!menuOpen)}>
-                <RiMenuFill size="20" />
-              </button>
-              {menuOpen && (
-                <div className="absolute right-0 mt-2 w-48 bg-surface border border-gray-200 dark:border-white/10 rounded shadow-lg z-20">
-                  <button
-                    className="w-full text-left px-4 py-2 hover:bg-secondary-hover flex items-center gap-2"
-                    onClick={() => {
-                      toggleIdorName();
-                      setMenuOpen(false);
-                    }}
-                  >
-                    <RiSwapBoxFill size="20" /> {showIdorName === "id" ? "Show Name" : "Show ID"}
-                  </button>
-                  <button
-                    className="w-full text-left px-4 py-2 hover:bg-secondary-hover flex items-center gap-2"
-                    onClick={() => {
-                      setShowUnlisted(!showUnlisted);
-                      setMenuOpen(false);
-                    }}
-                  >
-                    {showUnlisted ? <RiEyeOffFill size="20" /> : <RiEyeFill size="20" />}{" "}
-                    {showUnlisted ? "Hide Unlisted" : "Show Unlisted"}
-                  </button>
-                  <button
-                    className="w-full text-left px-4 py-2 hover:bg-secondary-hover flex items-center gap-2"
-                    onClick={() => {
-                      handleUnloadAllModels();
-                      setMenuOpen(false);
-                    }}
-                    disabled={isUnloading}
-                  >
-                    <RiEjectLine size="24" /> {isUnloading ? "Unloading..." : "Unload All"}
-                  </button>
-                </div>
-              )}
-            </div>
-          )}
-        </div>
-        {!isNarrow && (
-          <div className="flex justify-between">
-            <div className="flex gap-2">
-              <button
-                className="btn text-base flex items-center gap-2"
-                onClick={toggleIdorName}
-                style={{ lineHeight: "1.2" }}
-              >
-                <RiSwapBoxFill size="20" /> {showIdorName === "id" ? "ID" : "Name"}
-              </button>
-
-              <button
-                className="btn text-base flex items-center gap-2"
-                onClick={() => setShowUnlisted(!showUnlisted)}
-                style={{ lineHeight: "1.2" }}
-              >
-                {showUnlisted ? <RiEyeFill size="20" /> : <RiEyeOffFill size="20" />} unlisted
-              </button>
-            </div>
-            <button
-              className="btn text-base flex items-center gap-2"
-              onClick={handleUnloadAllModels}
-              disabled={isUnloading}
-            >
-              <RiEjectLine size="24" /> {isUnloading ? "Unloading..." : "Unload All"}
-            </button>
-          </div>
-        )}
-      </div>
-
-      <div className="flex-1 overflow-y-auto">
-        <table className="w-full">
-          <thead className="sticky top-0 bg-card z-10">
-            <tr className="text-left border-b border-gray-200 dark:border-white/10 bg-surface">
-              <th>{showIdorName === "id" ? "Model ID" : "Name"}</th>
-              <th></th>
-              <th>State</th>
-            </tr>
-          </thead>
-          <tbody>
-            {regularModels.map((model) => (
-              <tr key={model.id} className="border-b hover:bg-secondary-hover border-gray-200">
-                <td className={`${model.unlisted ? "text-txtsecondary" : ""}`}>
-                  <a href={`/upstream/${model.id}/`} className="font-semibold" target="_blank">
-                    {showIdorName === "id" ? model.id : model.name !== "" ? model.name : model.id}
-                  </a>
-
-                  {!!model.description && (
-                    <p className={model.unlisted ? "text-opacity-70" : ""}>
-                      <em>{model.description}</em>
-                    </p>
-                  )}
-                </td>
-                <td className="w-12">
-                  {model.state === "stopped" ? (
-                    <button className="btn btn--sm" onClick={() => loadModel(model.id)}>
-                      Load
-                    </button>
-                  ) : (
-                    <button
-                      className="btn btn--sm"
-                      onClick={() => unloadSingleModel(model.id)}
-                      disabled={model.state !== "ready"}
-                    >
-                      Unload
-                    </button>
-                  )}
-                </td>
-                <td className="w-20">
-                  <span className={`w-16 text-center status status--${model.state}`}>{model.state}</span>
-                </td>
-              </tr>
-            ))}
-          </tbody>
-        </table>
-
-        {Object.keys(peerModelsByPeerId).length > 0 && (
-          <>
-            <h3 className="mt-8 mb-2">Peer Models</h3>
-            {Object.entries(peerModelsByPeerId)
-              .sort(([a], [b]) => a.localeCompare(b))
-              .map(([peerId, models]) => (
-                <div key={peerId} className="mb-4">
-                  <table className="w-full">
-                    <thead className="sticky top-0 bg-card z-10">
-                      <tr className="text-left border-b border-gray-200 dark:border-white/10 bg-surface">
-                        <th className="font-semibold">{peerId}</th>
-                      </tr>
-                    </thead>
-                    <tbody>
-                      {models.map((model) => (
-                        <tr key={model.id} className="border-b hover:bg-secondary-hover border-gray-200">
-                          <td className={`pl-8 ${model.unlisted ? "text-txtsecondary" : ""}`}>
-                            <span>{model.id}</span>
-                          </td>
-                        </tr>
-                      ))}
-                    </tbody>
-                  </table>
-                </div>
-              ))}
-          </>
-        )}
-      </div>
-    </div>
-  );
-}
-
-interface HistogramData {
-  bins: number[];
-  min: number;
-  max: number;
-  binSize: number;
-  p99: number;
-  p95: number;
-  p50: number;
-}
-
-function TokenHistogram({ data }: { data: HistogramData }) {
-  const { bins, min, max, p50, p95, p99 } = data;
-  const maxCount = Math.max(...bins);
-
-  const height = 120;
-  const padding = { top: 10, right: 15, bottom: 25, left: 45 };
-
-  // Use viewBox for responsive sizing
-  const viewBoxWidth = 600;
-  const chartWidth = viewBoxWidth - padding.left - padding.right;
-  const chartHeight = height - padding.top - padding.bottom;
-
-  const barWidth = chartWidth / bins.length;
-  const range = max - min;
-
-  // Calculate x position for a given value
-  const getXPosition = (value: number) => {
-    return padding.left + ((value - min) / range) * chartWidth;
-  };
-
-  return (
-    <div className="mt-2 w-full">
-      <svg viewBox={`0 0 ${viewBoxWidth} ${height}`} className="w-full h-auto" preserveAspectRatio="xMidYMid meet">
-        {/* Y-axis */}
-        <line
-          x1={padding.left}
-          y1={padding.top}
-          x2={padding.left}
-          y2={height - padding.bottom}
-          stroke="currentColor"
-          strokeWidth="1"
-          opacity="0.3"
-        />
-
-        {/* X-axis */}
-        <line
-          x1={padding.left}
-          y1={height - padding.bottom}
-          x2={viewBoxWidth - padding.right}
-          y2={height - padding.bottom}
-          stroke="currentColor"
-          strokeWidth="1"
-          opacity="0.3"
-        />
-
-        {/* Histogram bars */}
-        {bins.map((count, i) => {
-          const barHeight = maxCount > 0 ? (count / maxCount) * chartHeight : 0;
-          const x = padding.left + i * barWidth;
-          const y = height - padding.bottom - barHeight;
-          const binStart = min + i * data.binSize;
-          const binEnd = binStart + data.binSize;
-
-          return (
-            <g key={i}>
-              <rect
-                x={x}
-                y={y}
-                width={Math.max(barWidth - 1, 1)}
-                height={barHeight}
-                fill="currentColor"
-                opacity="0.6"
-                className="text-blue-500 dark:text-blue-400 hover:opacity-90 transition-opacity cursor-pointer"
-              />
-              <title>{`${binStart.toFixed(1)} - ${binEnd.toFixed(1)} tokens/sec\nCount: ${count}`}</title>
-            </g>
-          );
-        })}
-
-        {/* Percentile lines */}
-        <line
-          x1={getXPosition(p50)}
-          y1={padding.top}
-          x2={getXPosition(p50)}
-          y2={height - padding.bottom}
-          stroke="currentColor"
-          strokeWidth="2"
-          strokeDasharray="4 2"
-          opacity="0.7"
-          className="text-gray-600 dark:text-gray-400"
-        />
-
-        <line
-          x1={getXPosition(p95)}
-          y1={padding.top}
-          x2={getXPosition(p95)}
-          y2={height - padding.bottom}
-          stroke="currentColor"
-          strokeWidth="2"
-          strokeDasharray="4 2"
-          opacity="0.7"
-          className="text-orange-500 dark:text-orange-400"
-        />
-
-        <line
-          x1={getXPosition(p99)}
-          y1={padding.top}
-          x2={getXPosition(p99)}
-          y2={height - padding.bottom}
-          stroke="currentColor"
-          strokeWidth="2"
-          strokeDasharray="4 2"
-          opacity="0.7"
-          className="text-green-500 dark:text-green-400"
-        />
-
-        {/* X-axis labels */}
-        <text x={padding.left} y={height - 5} fontSize="10" fill="currentColor" opacity="0.6" textAnchor="start">
-          {min.toFixed(1)}
-        </text>
-
-        <text
-          x={viewBoxWidth - padding.right}
-          y={height - 5}
-          fontSize="10"
-          fill="currentColor"
-          opacity="0.6"
-          textAnchor="end"
-        >
-          {max.toFixed(1)}
-        </text>
-
-        {/* X-axis label */}
-        <text
-          x={padding.left + chartWidth / 2}
-          y={height - 2}
-          fontSize="10"
-          fill="currentColor"
-          opacity="0.6"
-          textAnchor="middle"
-        >
-          Tokens/Second Distribution
-        </text>
-      </svg>
-    </div>
-  );
-}
-
-function StatsPanel() {
-  const { metrics } = useAPI();
-
-  const [totalRequests, totalInputTokens, totalOutputTokens, tokenStats, histogramData] = useMemo(() => {
-    const totalRequests = metrics.length;
-    if (totalRequests === 0) {
-      return [0, 0, 0, { p99: 0, p95: 0, p50: 0 }, null];
-    }
-    const totalInputTokens = metrics.reduce((sum, m) => sum + m.input_tokens, 0);
-    const totalOutputTokens = metrics.reduce((sum, m) => sum + m.output_tokens, 0);
-
-    // Calculate token statistics using output_tokens and duration_ms
-    // Filter out metrics with invalid duration or output tokens
-    const validMetrics = metrics.filter((m) => m.duration_ms > 0 && m.output_tokens > 0);
-    if (validMetrics.length === 0) {
-      return [totalRequests, totalInputTokens, totalOutputTokens, { p99: 0, p95: 0, p50: 0 }, null];
-    }
-
-    // Calculate tokens/second for each valid metric
-    const tokensPerSecond = validMetrics.map((m) => m.output_tokens / (m.duration_ms / 1000));
-
-    // Sort for percentile calculation
-    const sortedTokensPerSecond = [...tokensPerSecond].sort((a, b) => a - b);
-
-    // Calculate percentiles - showing speed thresholds where X% of requests are SLOWER (below)
-    // P99: 99% of requests are slower than this speed (99th percentile - fast requests)
-    // P95: 95% of requests are slower than this speed (95th percentile)
-    // P50: 50% of requests are slower than this speed (median)
-    const p99 = sortedTokensPerSecond[Math.floor(sortedTokensPerSecond.length * 0.99)];
-    const p95 = sortedTokensPerSecond[Math.floor(sortedTokensPerSecond.length * 0.95)];
-    const p50 = sortedTokensPerSecond[Math.floor(sortedTokensPerSecond.length * 0.5)];
-
-    // Create histogram data
-    const min = Math.min(...tokensPerSecond);
-    const max = Math.max(...tokensPerSecond);
-    const binCount = Math.min(30, Math.max(10, Math.floor(tokensPerSecond.length / 5))); // Adaptive bin count
-    const binSize = (max - min) / binCount;
-
-    const bins = Array(binCount).fill(0);
-    tokensPerSecond.forEach((value) => {
-      const binIndex = Math.min(Math.floor((value - min) / binSize), binCount - 1);
-      bins[binIndex]++;
-    });
-
-    const histogramData = {
-      bins,
-      min,
-      max,
-      binSize,
-      p99,
-      p95,
-      p50,
-    };
-
-    return [
-      totalRequests,
-      totalInputTokens,
-      totalOutputTokens,
-      {
-        p99: p99.toFixed(2),
-        p95: p95.toFixed(2),
-        p50: p50.toFixed(2),
-      },
-      histogramData,
-    ];
-  }, [metrics]);
-
-  const nf = new Intl.NumberFormat();
-
-  return (
-    <div className="card">
-      <div className="rounded-lg overflow-hidden border border-card-border-inner">
-        <table className="min-w-full divide-y divide-card-border-inner">
-          <thead className="bg-secondary">
-            <tr>
-              <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-txtmain">
-                Requests
-              </th>
-              <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-txtmain border-l border-card-border-inner">
-                Processed
-              </th>
-              <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-txtmain border-l border-card-border-inner">
-                Generated
-              </th>
-              <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-txtmain border-l border-card-border-inner">
-                Token Stats (tokens/sec)
-              </th>
-            </tr>
-          </thead>
-
-          <tbody className="bg-surface divide-y divide-card-border-inner">
-            <tr className="hover:bg-secondary">
-              <td className="px-4 py-4 text-sm font-semibold text-gray-900 dark:text-white">{totalRequests}</td>
-
-              <td className="px-4 py-4 text-sm text-gray-700 dark:text-gray-300 border-l border-gray-200 dark:border-white/10">
-                <div className="flex items-center gap-2">
-                  <span className="text-sm font-medium">{nf.format(totalInputTokens)}</span>
-                  <span className="text-xs text-gray-500 dark:text-gray-400">tokens</span>
-                </div>
-              </td>
-
-              <td className="px-4 py-4 text-sm text-gray-700 dark:text-gray-300 border-l border-gray-200 dark:border-white/10">
-                <div className="flex items-center gap-2">
-                  <span className="text-sm font-medium">{nf.format(totalOutputTokens)}</span>
-                  <span className="text-xs text-gray-500 dark:text-gray-400">tokens</span>
-                </div>
-              </td>
-
-              <td className="px-4 py-4 border-l border-gray-200 dark:border-white/10">
-                <div className="space-y-3">
-                  <div className="grid grid-cols-3 gap-2 items-center">
-                    <div className="text-center">
-                      <div className="text-xs text-gray-500 dark:text-gray-400">P50</div>
-                      <div className="mt-1 inline-block rounded-full bg-gray-100 dark:bg-white/5 px-3 py-1 text-sm font-semibold text-gray-800 dark:text-white">
-                        {tokenStats.p50}
-                      </div>
-                    </div>
-
-                    <div className="text-center">
-                      <div className="text-xs text-gray-500 dark:text-gray-400">P95</div>
-                      <div className="mt-1 inline-block rounded-full bg-gray-100 dark:bg-white/5 px-3 py-1 text-sm font-semibold text-gray-800 dark:text-white">
-                        {tokenStats.p95}
-                      </div>
-                    </div>
-
-                    <div className="text-center">
-                      <div className="text-xs text-gray-500 dark:text-gray-400">P99</div>
-                      <div className="mt-1 inline-block rounded-full bg-gray-100 dark:bg-white/5 px-3 py-1 text-sm font-semibold text-gray-800 dark:text-white">
-                        {tokenStats.p99}
-                      </div>
-                    </div>
-                  </div>
-                  {histogramData && <TokenHistogram data={histogramData} />}
-                </div>
-              </td>
-            </tr>
-          </tbody>
-        </table>
-      </div>
-    </div>
-  );
-}

ui/src/vite-env.d.ts

@@ -1 +0,0 @@
-/// <reference types="vite/client" />

ui/tsconfig.app.json

@@ -1,27 +0,0 @@
-{
-  "compilerOptions": {
-    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
-    "target": "ES2020",
-    "useDefineForClassFields": true,
-    "lib": ["ES2020", "DOM", "DOM.Iterable"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "verbatimModuleSyntax": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-    "jsx": "react-jsx",
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "erasableSyntaxOnly": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
-  },
-  "include": ["src"]
-}

ui/tsconfig.json

@@ -1,7 +0,0 @@
-{
-  "files": [],
-  "references": [
-    { "path": "./tsconfig.app.json" },
-    { "path": "./tsconfig.node.json" }
-  ]
-}

ui/tsconfig.node.json

@@ -1,25 +0,0 @@
-{
-  "compilerOptions": {
-    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
-    "target": "ES2022",
-    "lib": ["ES2023"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "verbatimModuleSyntax": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "erasableSyntaxOnly": true,
-    "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
-  },
-  "include": ["vite.config.ts"]
-}

ui/vite.config.ts

@@ -1,21 +0,0 @@
-import { defineConfig } from "vite";
-import react from "@vitejs/plugin-react";
-import tailwindcss from "@tailwindcss/vite";
-
-// https://vite.dev/config/
-export default defineConfig({
-  plugins: [react(), tailwindcss()],
-  base: "/ui/",
-  build: {
-    outDir: "../proxy/ui_dist",
-    assetsDir: "assets",
-  },
-  server: {
-    proxy: {
-      "/api": "http://localhost:8080", // Proxy API calls to Go backend during development
-      "/logs": "http://localhost:8080",
-      "/upstream": "http://localhost:8080",
-      "/unload": "http://localhost:8080",
-    },
-  },
-});