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)/explore.tsx

@@ -10,6 +10,7 @@ import { ensureHealthPermissions, fetchHealthDataForDate, fetchTodayHealthData }
 import { Ionicons } from '@expo/vector-icons';
 import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';
 import { useFocusEffect } from '@react-navigation/native';
+import { useRouter } from 'expo-router';
 import React, { useEffect, useMemo, useRef, useState } from 'react';
 import {
   SafeAreaView,
@@ -22,6 +23,7 @@ import {
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 export default function ExploreScreen() {
+  const router = useRouter();
   const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
   const colorTokens = Colors[theme];
   const stepGoal = useAppSelector((s) => s.user.profile?.dailyStepsGoal) ?? 2000;
@@ -143,8 +145,13 @@ export default function ExploreScreen() {
             })}
           </ScrollView>
 
-          {/* 今日报告 标题 */}
-          <Text style={styles.sectionTitle}>今日报告</Text>
+          {/* 打卡入口 */}
+          <View style={{ flexDirection: 'row', justifyContent: 'space-between', alignItems: 'center', marginTop: 24, marginBottom: 8 }}>
+            <Text style={styles.sectionTitle}>今日报告</Text>
+            <TouchableOpacity onPress={() => router.push('/checkin/calendar')} accessibilityRole="button">
+              <Text style={{ color: '#6B7280', fontWeight: '700' }}>查看打卡日历</Text>
+            </TouchableOpacity>
+          </View>
 
           {/* 取消卡片内 loading，保持静默刷新提升体验 */}
 

app/(tabs)/index.tsx

@@ -172,11 +172,12 @@ export default function HomeScreen() {
                 level="初学者"
                 progress={0}
               />
-              <Pressable onPress={() => pushIfAuthedElseLogin('/challenge')}>
+              {/* 原“每周打卡”改为进入打卡日历 */}
+              <Pressable onPress={() => router.push('/checkin/calendar')}>
                 <PlanCard
                   image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
-                  title="每周打卡"
-                  subtitle="养成训练习惯，练出好身材"
+                  title="打卡日历"
+                  subtitle="查看每日打卡记录（点亮日期）"
                   progress={0.75}
                 />
               </Pressable>

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 = () => {