feat: 优化 AI 教练聊天和打卡功能

- 在 AI 教练聊天界面中添加会话缓存功能，支持冷启动时恢复聊天记录
- 实现轻量防抖机制，确保会话变动时及时保存缓存
- 在打卡功能中集成按月加载打卡记录，提升用户体验
- 更新 Redux 状态管理，支持打卡记录的按月加载和缓存
- 新增打卡日历页面，允许用户查看每日打卡记录
- 优化样式以适应新功能的展示和交互

app/(tabs)/personal.tsx

@@ -72,15 +72,26 @@ export default function PersonalScreen() {
 
   useEffect(() => { load(); }, []);
   useFocusEffect(React.useCallback(() => {
-    // 每次聚焦时从后端拉取最新用户资料
+    // 聚焦时只拉后端，避免与本地 load 循环触发
     dispatch(fetchMyProfile());
-    load();
     return () => { };
   }, [dispatch]));
   useEffect(() => {
-    if (userProfileFromRedux) {
-      setProfile(userProfileFromRedux);
-    }
+    const r = userProfileFromRedux as any;
+    if (!r) return;
+    setProfile((prev) => {
+      const next = { ...prev } as any;
+      const nameNext = (r.name && String(r.name)) || prev.name;
+      const genderNext = (r.gender === 'male' || r.gender === 'female') ? r.gender : (prev.gender ?? '');
+      const avatarUriNext = typeof r.avatar === 'string' && (r.avatar.startsWith('http') || r.avatar.startsWith('data:'))
+        ? r.avatar
+        : prev.avatarUri;
+      let changed = false;
+      if (next.name !== nameNext) { next.name = nameNext; changed = true; }
+      if (next.gender !== genderNext) { next.gender = genderNext; changed = true; }
+      if (next.avatarUri !== avatarUriNext) { next.avatarUri = avatarUriNext; changed = true; }
+      return changed ? next : prev;
+    });
   }, [userProfileFromRedux]);
 
   const formatHeight = () => {