ui: convert Image, Speech, Audio interfaces to shadcn buttons

Replace .btn elements and inline SVG icons with shadcn Button and
@lucide/svelte icons in the image, speech and audio playground tabs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UmuGqwNBJNEAMaWsdCDqUC

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

@@ -4,6 +4,8 @@
   import { transcribeAudio } from "../../lib/audioApi";
   import { playgroundStores } from "../../stores/playgroundActivity";
   import ModelSelector from "./ModelSelector.svelte";
+  import { Button } from "$lib/components/ui/button/index.js";
+  import { Copy, Check } from "@lucide/svelte";
 
   const selectedModelStore = persistentStore<string>("playground-audio-model", "");
 
@@ -169,22 +171,19 @@
       {: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"
+            <h3 class="pb-0 font-medium">Transcription Result</h3>
+            <Button
+              variant="outline"
+              size="icon-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>
+                <Check class="text-success" />
               {: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>
+                <Copy />
               {/if}
-            </button>
+            </Button>
           </div>
           <div class="flex-1 overflow-auto p-3 rounded border border-border bg-background whitespace-pre-wrap">
             {transcriptionResult}
@@ -223,33 +222,21 @@
         onchange={handleFileSelect}
         bind:this={fileInput}
       />
-      <button
-        class="btn"
-        onclick={() => fileInput?.click()}
-        disabled={isTranscribing}
-      >
+      <Button variant="outline" onclick={() => fileInput?.click()} disabled={isTranscribing}>
         Browse Files
-      </button>
+      </Button>
       <div class="flex-1"></div>
       {#if isTranscribing}
-        <button class="btn bg-red-500 hover:bg-red-600 text-white" onclick={cancelTranscription}>
-          Cancel
-        </button>
+        <Button variant="destructive" onclick={cancelTranscription}>Cancel</Button>
       {:else}
-        <button
-          class="btn bg-primary text-primary-foreground hover:opacity-90"
-          onclick={transcribe}
-          disabled={!canTranscribe}
-        >
-          Transcribe
-        </button>
-        <button
-          class="btn"
+        <Button onclick={transcribe} disabled={!canTranscribe}>Transcribe</Button>
+        <Button
+          variant="outline"
           onclick={clearAll}
           disabled={!selectedFile && !transcriptionResult && !error}
         >
           Clear
-        </button>
+        </Button>
       {/if}
     </div>
   {/if}

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

@@ -7,6 +7,7 @@
   import ModelSelector from "./ModelSelector.svelte";
   import ExpandableTextarea from "./ExpandableTextarea.svelte";
   import type { ImageApiMode, SdApiLora, SdApiLoraRef } from "../../lib/types";
+  import { Button } from "$lib/components/ui/button/index.js";
 
   const selectedModelStore = persistentStore<string>("playground-image-model", "");
   const selectedSizeStore = persistentStore<string>("playground-image-size", "1024x1024");
@@ -226,12 +227,9 @@
     </select>
 
     {#if isSdapi}
-      <button
-        class="px-3 py-2 rounded border border-border bg-background hover:bg-accent transition-colors"
-        onclick={() => showSettings = !showSettings}
-      >
+      <Button variant="outline" onclick={() => showSettings = !showSettings}>
         {showSettings ? "Hide Settings" : "Settings"}
-      </button>
+      </Button>
     {/if}
   </div>
 
@@ -330,13 +328,14 @@
       <div>
         <span class="text-xs text-muted-foreground block mb-1">LoRAs</span>
         <div class="flex items-center gap-2 mb-2">
-          <button
-            class="px-3 py-1.5 text-sm rounded border border-border bg-background hover:bg-accent transition-colors disabled:opacity-50"
+          <Button
+            variant="outline"
+            size="sm"
             onclick={loadLoras}
             disabled={!$selectedModelStore || isLoadingLoras}
           >
             {isLoadingLoras ? "Loading..." : lorasLoaded ? "Reload LoRAs" : "Load LoRAs"}
-          </button>
+          </Button>
           {#if lorasLoaded && availableLoras.length > 0}
             <select
               class="flex-1 px-2 py-1.5 text-sm rounded border border-border bg-background focus:outline-none focus:ring-2 focus:ring-primary"
@@ -471,24 +470,25 @@
       />
       <div class="flex flex-row md:flex-col gap-2">
         {#if isGenerating}
-          <button class="btn bg-red-500 hover:bg-red-600 text-white flex-1 md:flex-none" onclick={cancelGeneration}>
+          <Button variant="destructive" class="flex-1 md:flex-none" onclick={cancelGeneration}>
             Cancel
-          </button>
+          </Button>
         {:else}
-          <button
-            class="btn bg-primary text-primary-foreground hover:opacity-90 flex-1 md:flex-none"
+          <Button
+            class="flex-1 md:flex-none"
             onclick={generate}
             disabled={!prompt.trim() || !$selectedModelStore}
           >
             Generate
-          </button>
-          <button
-            class="btn flex-1 md:flex-none"
+          </Button>
+          <Button
+            variant="outline"
+            class="flex-1 md:flex-none"
             onclick={clearImage}
             disabled={generatedImages.length === 0 && !error && !prompt.trim()}
           >
             Clear
-          </button>
+          </Button>
         {/if}
       </div>
     </div>

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

@@ -5,6 +5,8 @@
   import { playgroundStores } from "../../stores/playgroundActivity";
   import ModelSelector from "./ModelSelector.svelte";
   import ExpandableTextarea from "./ExpandableTextarea.svelte";
+  import { Button } from "$lib/components/ui/button/index.js";
+  import { RefreshCw, Download } from "@lucide/svelte";
 
   const selectedModelStore = persistentStore<string>("playground-speech-model", "");
   const selectedVoiceStore = persistentStore<string>("playground-speech-voice", "coral");
@@ -220,23 +222,16 @@
         <option value="(refresh)">(refresh)</option>
       </select>
       {#if $selectedModelStore && !getVoicesCache()[$selectedModelStore]}
-        <button
-          class="btn shrink-0"
+        <Button
+          variant="outline"
+          size="icon"
+          class="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>
+          <RefreshCw class={isLoadingVoices ? "animate-spin" : ""} />
+        </Button>
       {/if}
     </div>
   </div>
@@ -285,15 +280,9 @@
                 </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>
+            <Button variant="outline" size="icon" class="shrink-0" onclick={downloadAudio} title="Download audio file">
+              <Download />
+            </Button>
           </div>
 
           <!-- Audio player with larger controls -->
@@ -327,24 +316,25 @@
       />
       <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}>
+          <Button variant="destructive" class="flex-1 md:flex-none" onclick={cancelGeneration}>
             Cancel
-          </button>
+          </Button>
         {:else}
-          <button
-            class="btn bg-primary text-primary-foreground hover:opacity-90 flex-1 md:flex-none"
+          <Button
+            class="flex-1 md:flex-none"
             onclick={generate}
             disabled={!inputText.trim() || !$selectedModelStore}
           >
             Generate
-          </button>
-          <button
-            class="btn flex-1 md:flex-none"
+          </Button>
+          <Button
+            variant="outline"
+            class="flex-1 md:flex-none"
             onclick={clearInput}
             disabled={!inputText.trim()}
           >
             Clear
-          </button>
+          </Button>
           <label class="flex items-center justify-center gap-2 text-sm cursor-pointer">
             <input
               type="checkbox"