web: i18n support — English, 简体中文, 繁體中文, Italiano

Lightweight i18n without react-i18next: a LocaleProvider context +
useLocale() hook with {{var}} interpolation, auto-detect from
navigator.language, persisted to localStorage.

98 translation keys across 4 locale files (en/zh-CN/zh-TW/it).
All user-visible strings in App/Brain/Profiling/ErrorBoundary are
now t() calls. Language switcher added to the sidebar footer.

Build clean (tsc + vite), 18 tests pass.

web/src/i18n/zh-TW.ts

@@ -0,0 +1,113 @@
+const zhTW: Record<string, string> = {
+  "nav.chat": "對話",
+  "nav.brain": "大腦",
+  "nav.profiling": "效能分析",
+
+  "brand.tagline": "本地巨人，極小足跡",
+
+  "sidebar.connection": "連線",
+  "sidebar.endpoint": "API 端點",
+  "sidebar.apiKey": "API 金鑰",
+  "sidebar.apiKeyPlaceholder": "選填",
+  "sidebar.apiKeyHelp": "僅保存在記憶體中 · 傳送到此端點",
+  "sidebar.probe": "探測伺服器",
+  "status.connected": "引擎已連線",
+  "status.notConnected": "未連線",
+  "status.runtimeUnavailable": "執行階段指標不可用",
+  "status.serverError": "無法連線到伺服器。",
+  "status.generationFailed": "生成失敗。",
+
+  "sidebar.runtime": "執行階段",
+  "sidebar.runtimeProbe": "探測伺服器以檢視執行階段狀態。",
+  "sidebar.schedulerOnline": "排程器上線",
+  "dashboard.active": "進行中",
+  "dashboard.queued": "排隊中",
+  "dashboard.completed": "已完成",
+  "dashboard.failures": "失敗",
+  "dashboard.session": "工作階段：",
+  "dashboard.prompt": "提示詞",
+  "dashboard.completion": "補全",
+
+  "tier.vram": "VRAM",
+  "tier.ram": "RAM",
+  "tier.disk": "磁碟",
+  "tier.ariaLabel": "專家分佈：{{vram}} VRAM、{{ram}} RAM、{{disk}} 磁碟",
+
+  "sidebar.inference": "推論",
+  "sidebar.model": "模型",
+  "sidebar.kvSession": "KV 工作階段",
+  "sidebar.kvSessionHelp": "獨立上下文 · 對話跟隨所選插槽",
+  "sidebar.sessionLabel": "工作階段 {{slot}}",
+  "sidebar.temperature": "溫度",
+  "sidebar.maxTokens": "最大輸出 token 數",
+  "sidebar.reasoning": "推理模式",
+  "sidebar.transport": "OpenAI 相容協定",
+
+  "topbar.activeModel": "目前模型",
+  "topbar.tokens": "{{n}} tokens",
+  "topbar.tokPerSec": "{{n}} tok/s",
+  "topbar.slot": "插槽 {{n}}",
+  "topbar.clear": "清除",
+
+  "hero.title": "COLIBRÌ 引擎",
+  "hero.subtitle": "向巨人提問。",
+  "hero.tagline": "讓機器屬於你。",
+  "hero.description": "連線到本地 colibrì 伺服器，直接從你的硬體串流取得回應。所有資料都留在你選擇的端點內。",
+  "prompts.routing": "解釋專家路由如何運作",
+  "prompts.benchmark": "撰寫一個簡單的 C 基準測試",
+  "prompts.caching": "比較 RAM 與 VRAM 快取",
+
+  "chat.you": "你",
+  "chat.colibri": "colibrì",
+  "chat.placeholder": "傳送訊息給 colibrì…",
+  "chat.inputHint": "Enter 傳送 · Shift+Enter 換行",
+  "chat.stop": "停止生成",
+  "chat.send": "傳送訊息",
+
+  "brain.title": "專家皮層",
+  "brain.waiting": "等待引擎連線",
+  "brain.layers": "{{rows}} 層 × {{cols}} 專家",
+  "brain.brightnessHint": "亮度 = 路由熱度",
+  "brain.flashHint": "⚡ 白色閃爍 = 本輪被路由",
+  "brain.connectHint": "連線引擎以檢視皮層。",
+  "brain.neverRouted": "從未被路由",
+  "brain.selections": "約 2^{{heat}} 次選擇",
+  "brain.specialist": "⭐ 專精：{{top}}",
+  "brain.generalist": "通用型",
+  "brain.mtp": "MTP 頭 — 為推測式解碼起草下一個 token",
+  "brain.early": "早期層 — 表面特徵：token、拼寫、局部語法",
+  "brain.lowerMiddle": "中低層 — 片語結構、詞語關係、簡單事實",
+  "brain.upperMiddle": "中高層 — 語意、長距離上下文、推理步驟",
+  "brain.late": "後期層 — 規劃答案、風格、連貫性",
+  "brain.final": "末尾層 — 輸出成型：選擇實際的 next-token 分佈",
+
+  "profile.title": "效能分析 — 引擎每輪的時間花在哪裡",
+  "profile.ioWait": "I/O 等待",
+  "profile.expertMatmul": "專家矩陣乘",
+  "profile.attention": "注意力",
+  "profile.lmHead": "LM head",
+  "profile.other": "其他",
+  "profile.empty": "尚無效能數據 — 傳送一則訊息，分析結果將顯示在這裡。",
+  "profile.connectHint": "連線引擎以採集每輪耗時。",
+  "profile.lastTurn": "最近一輪",
+  "profile.wallTime": "總耗時",
+  "profile.batching": "批次處理",
+  "profile.tokensPerForward": "tokens / 前向",
+  "profile.diskService": "磁碟服務",
+  "profile.overlapped": "與運算重疊",
+  "profile.window": "視窗 · 最近 {{n}} 輪",
+  "profile.throughputTitle": "每輪吞吐量 (tok/s)",
+  "profile.phaseTitle": "每輪各階段耗時 (s)",
+  "profile.turnCol": "輪次",
+  "profile.tokensCol": "Tokens",
+  "profile.wallCol": "總耗時",
+  "profile.turnsLabel": "{{n}} 輪 · 從舊到新",
+  "profile.oneTurn": "1 輪",
+  "profile.diskNote": "磁碟服務是在 I/O 執行緒上讀取專家的時間；它與運算重疊，因此只有運算執行緒實際感受到的 I/O 等待 才計入總耗時分解。多 KV 工作階段時，份額描述的是整個引擎在該輪視窗內的表現。",
+
+  "error.title": "colibrì UI 遇到錯誤",
+  "error.hint": "引擎不受影響。請嘗試重新整理頁面。",
+  "error.retry": "重試",
+}
+
+export default zhTW