style: 样式优化

frontend/src/lib/i18n/en-US.ts

@@ -89,6 +89,42 @@ export const enUS: TranslationMap = {
   "sidebar.messages": " messages",
   "sidebar.rename": "Rename",
   "sidebar.delete": "Delete",
+  "sidebar.search": "Search conversations...",
+  "sidebar.today": "Today",
+  "sidebar.yesterday": "Yesterday",
+  "sidebar.earlier": "Earlier",
+  "sidebar.pinned": "Pinned",
+  "sidebar.video": "Video",
+  "sidebar.clearHistory": "Clear History",
+
+  // Scene cards (empty state)
+  "scene.describe": "Describe my surroundings",
+  "scene.describe.desc": "Let AI observe and describe the current scene",
+  "scene.text": "Recognize text in view",
+  "scene.text.desc": "Extract and translate text from the scene",
+  "scene.object": "Analyze this object",
+  "scene.object.desc": "Identify objects and provide information",
+  "scene.suggest": "Give me suggestions",
+  "scene.suggest.desc": "Practical suggestions based on the current scene",
+
+  // Video controls (enhanced)
+  "controls.recognize": "Analyze Scene",
+  "controls.device.camera": "Camera",
+  "controls.device.mic": "Microphone",
+  "controls.device.default": "Default",
+  "controls.mode.realtime": "Realtime",
+  "controls.mode.ondemand": "On-demand",
+  "controls.mode.chat": "Chat only",
+
+  // Status bar
+  "statusbar.ready": "Ready · Select devices to start",
+  "statusbar.calling": "In call",
+  "statusbar.duration": "Duration",
+  "statusbar.recognitions": "recognitions",
+  "statusbar.tokens": "Tokens",
+
+  // Input enhanced
+  "chat.input.voice": "Voice input",
 
   // Device errors
   "error.vadInit": "VAD initialization failed",

frontend/src/lib/i18n/ja-JP.ts

@@ -89,6 +89,42 @@ export const jaJP: TranslationMap = {
   "sidebar.messages": "件のメッセージ",
   "sidebar.rename": "名前を変更",
   "sidebar.delete": "削除",
+  "sidebar.search": "会話を検索...",
+  "sidebar.today": "今日",
+  "sidebar.yesterday": "昨日",
+  "sidebar.earlier": "それ以前",
+  "sidebar.pinned": "ピン留め",
+  "sidebar.video": "ビデオ",
+  "sidebar.clearHistory": "履歴をクリア",
+
+  // Scene cards (empty state)
+  "scene.describe": "周囲のシーンを説明して",
+  "scene.describe.desc": "AIが現在のシーンを観察して説明します",
+  "scene.text": "画面のテキストを認識",
+  "scene.text.desc": "シーン内のテキストを抽出・翻訳します",
+  "scene.object": "この物を分析して",
+  "scene.object.desc": "物体を識別して関連情報を提供します",
+  "scene.suggest": "アドバイスをください",
+  "scene.suggest.desc": "現在のシーンに基づいた実用的な提案",
+
+  // Video controls (enhanced)
+  "controls.recognize": "シーンを分析",
+  "controls.device.camera": "カメラ",
+  "controls.device.mic": "マイク",
+  "controls.device.default": "デフォルト",
+  "controls.mode.realtime": "リアルタイム",
+  "controls.mode.ondemand": "オンデマンド",
+  "controls.mode.chat": "チャットのみ",
+
+  // Status bar
+  "statusbar.ready": "準備完了 · デバイスを選択して開始",
+  "statusbar.calling": "通話中",
+  "statusbar.duration": "通話時間",
+  "statusbar.recognitions": "回の認識",
+  "statusbar.tokens": "トークン",
+
+  // Input enhanced
+  "chat.input.voice": "音声入力",
 
   // Device errors
   "error.vadInit": "VAD初期化に失敗しました",

frontend/src/lib/i18n/zh-CN.ts

@@ -89,6 +89,42 @@ export const zhCN: TranslationMap = {
   "sidebar.messages": "条消息",
   "sidebar.rename": "重命名",
   "sidebar.delete": "删除",
+  "sidebar.search": "搜索对话...",
+  "sidebar.today": "今天",
+  "sidebar.yesterday": "昨天",
+  "sidebar.earlier": "更早",
+  "sidebar.pinned": "置顶",
+  "sidebar.video": "视频",
+  "sidebar.clearHistory": "清除历史",
+
+  // Scene cards (empty state)
+  "scene.describe": "描述我面前的场景",
+  "scene.describe.desc": "让 AI 观察并描述当前画面",
+  "scene.text": "识别画面中的文字",
+  "scene.text.desc": "提取并翻译画面里的文字",
+  "scene.object": "帮我分析这个物品",
+  "scene.object.desc": "识别物体并给出相关信息",
+  "scene.suggest": "给我一些建议",
+  "scene.suggest.desc": "基于当前场景给出实用建议",
+
+  // Video controls (enhanced)
+  "controls.recognize": "识别画面",
+  "controls.device.camera": "摄像头",
+  "controls.device.mic": "麦克风",
+  "controls.device.default": "默认",
+  "controls.mode.realtime": "实时分析",
+  "controls.mode.ondemand": "按需识别",
+  "controls.mode.chat": "纯聊天",
+
+  // Status bar
+  "statusbar.ready": "就绪 · 选择设备后开始通话",
+  "statusbar.calling": "通话中",
+  "statusbar.duration": "通话时长",
+  "statusbar.recognitions": "次识别",
+  "statusbar.tokens": "Token",
+
+  // Input enhanced
+  "chat.input.voice": "语音输入",
 
   // Device errors
   "error.vadInit": "VAD 初始化失败",