优化: aichat 体验收尾(useAiEvents拆分4子域 + AIC-FIX P1队列/mutex/缓存 + i18n残留抽取)

src/i18n/en/aiChat.ts

@@ -246,5 +246,22 @@ export default {
     ciNFailed: '{n} failed',
     ciNPending: '{n} pending',
     ciNPassed: '{n} passed',
+
+    // ── MessageList token detail popover (per-fee breakdown: input/cache hit/output/reasoning) ──
+    tokenDetailTitle: 'Token usage details',
+    estimated: 'estimated',
+    tokenInLabel: 'Input (cache miss, full price)',
+    tokenCacheLabel: 'Cache hit (low price)',
+    tokenOutLabel: 'Output',
+    tokenReasonLabel: 'Reasoning',
+    tokenCacheRateLabel: 'Cache hit rate',
+    tokenModelLabel: 'Model',
+    tokenUsageNoteLabel: 'Usage note',
+    tokenUsageNote: 'prompt_tokens missing, shown as estimated',
+
+    // ── TopBar goal/project context labels ──
+    goalsCount: 'Goals ({n})',
+    none: 'None',
+    projectLabel: "{'@'}Projects",
   },
 }