feat: 优化情景切换功能

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

@@ -33,14 +33,19 @@ export const zhCN: TranslationMap = {
   "scenario.choose": "选择对话情景",
   "scenario.freeChat": "自由对话",
   "scenario.freeChat.desc": "AI 视觉助手，自由聊天",
+  "scenario.freeChat.hint": "AI 会作为视觉助手回答你的问题",
   "scenario.interviewer": "模拟面试官",
   "scenario.interviewer.desc": "AI 扮演面试官，进行模拟面试",
+  "scenario.interviewer.hint": "AI 会扮演面试官，逐步提出专业问题并点评你的回答",
   "scenario.englishTeacher": "英语老师",
   "scenario.englishTeacher.desc": "AI 英语外教，纠正语法并引导对话",
+  "scenario.englishTeacher.hint": "AI 会用英语对话，纠正语法错误并引导深入交流",
   "scenario.debate": "辩论对手",
   "scenario.debate.desc": "AI 反驳你的观点，锻炼逻辑思维",
+  "scenario.debate.hint": "AI 会站在反方立场，用逻辑和证据反驳你的观点",
   "scenario.interpreter": "同声翻译",
   "scenario.interpreter.desc": "实时中英互译，口语化翻译",
+  "scenario.interpreter.hint": "AI 会实时翻译你的话（中英互译），无解释评论",
 
   // Video indicators
   "video.observing": "👁️ 观察中",