internal/server,ui: add new Acitivty page column - Drafted (#859)

Add draft metrics to activity log

internal/server/metrics.go

@@ -25,6 +25,8 @@ import (
 // TokenMetrics holds token usage and performance metrics.
 type TokenMetrics struct {
 	CachedTokens    int     `json:"cache_tokens"`
+	DraftTokens     int     `json:"draft_tokens"`
+	DraftAccTokens  int     `json:"draft_acc_tokens"`
 	InputTokens     int     `json:"input_tokens"`
 	OutputTokens    int     `json:"output_tokens"`
 	PromptPerSecond float64 `json:"prompt_per_second"`
@@ -345,6 +347,8 @@ func buildMetrics(modelID string, start time.Time, inputTokens, outputTokens, ca
 	durationMs := wallDurationMs
 	tokensPerSecond := -1.0
 	promptPerSecond := -1.0
+	draftTokens := -1
+	draftAccTokens := -1
 
 	if timings.Exists() {
 		inputTokens = timings.Get("prompt_n").Int()
@@ -358,6 +362,10 @@ func buildMetrics(modelID string, start time.Time, inputTokens, outputTokens, ca
 		if cachedValue := timings.Get("cache_n"); cachedValue.Exists() {
 			cachedTokens = cachedValue.Int()
 		}
+		if timings.Get("draft_n").Exists() && timings.Get("draft_n_accepted").Exists() {
+			draftTokens = int(timings.Get("draft_n").Int())
+			draftAccTokens = int(timings.Get("draft_n_accepted").Int())
+		}
 	}
 
 	return ActivityLogEntry{
@@ -365,6 +373,8 @@ func buildMetrics(modelID string, start time.Time, inputTokens, outputTokens, ca
 		Model:     modelID,
 		Tokens: TokenMetrics{
 			CachedTokens:    int(cachedTokens),
+			DraftTokens:     draftTokens,
+			DraftAccTokens:  draftAccTokens,
 			InputTokens:     int(inputTokens),
 			OutputTokens:    int(outputTokens),
 			PromptPerSecond: promptPerSecond,