feat: 优化 AI 教练聊天界面和个人信息页面

- 在 AI 教练聊天界面中添加消息自动滚动功能，提升用户体验
- 更新消息发送逻辑，确保新消息渲染后再滚动
- 在个人信息页面中集成用户资料拉取功能，支持每次聚焦时更新用户信息
- 修改登录页面，增加身份令牌验证，确保安全性
- 更新样式以适应新功能的展示和交互

app/(tabs)/personal.tsx

@@ -1,8 +1,8 @@
 import { Colors } from '@/constants/Colors';
 import { getTabBarBottomPadding } from '@/constants/TabBar';
-import { useAppSelector } from '@/hooks/redux';
+import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { useColorScheme } from '@/hooks/useColorScheme';
-import { DEFAULT_MEMBER_NAME } from '@/store/userSlice';
+import { DEFAULT_MEMBER_NAME, fetchMyProfile } from '@/store/userSlice';
 import { Ionicons } from '@expo/vector-icons';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';
@@ -14,6 +14,7 @@ import { Alert, Image, SafeAreaView, ScrollView, StatusBar, StyleSheet, Switch,
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 export default function PersonalScreen() {
+  const dispatch = useAppDispatch();
   const insets = useSafeAreaInsets();
   const tabBarHeight = useBottomTabBarHeight();
   const bottomPadding = useMemo(() => {
@@ -69,7 +70,12 @@ export default function PersonalScreen() {
   };
 
   useEffect(() => { load(); }, []);
-  useFocusEffect(React.useCallback(() => { load(); return () => { }; }, []));
+  useFocusEffect(React.useCallback(() => {
+    // 每次聚焦时从后端拉取最新用户资料
+    dispatch(fetchMyProfile());
+    load();
+    return () => { };
+  }, [dispatch]));
   useEffect(() => {
     if (userProfileFromRedux) {
       setProfile(userProfileFromRedux);