feat: 添加训练计划和打卡功能

- 新增训练计划页面，允许用户制定个性化的训练计划
- 集成打卡功能，用户可以记录每日的训练情况
- 更新 Redux 状态管理，添加训练计划相关的 reducer
- 在首页中添加训练计划卡片，支持用户点击跳转
- 更新样式和布局，以适应新功能的展示和交互
- 添加日期选择器和相关依赖，支持用户选择训练日期

app/(tabs)/explore.tsx

@@ -3,6 +3,7 @@ import { CircularRing } from '@/components/CircularRing';
 import { ProgressBar } from '@/components/ProgressBar';
 import { Colors } from '@/constants/Colors';
 import { getTabBarBottomPadding } from '@/constants/TabBar';
+import { useColorScheme } from '@/hooks/useColorScheme';
 import { getMonthDaysZh, getMonthTitleZh, getTodayIndexInMonth } from '@/utils/date';
 import { ensureHealthPermissions, fetchHealthDataForDate, fetchTodayHealthData } from '@/utils/health';
 import { Ionicons } from '@expo/vector-icons';
@@ -20,6 +21,8 @@ import {
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 export default function ExploreScreen() {
+  const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
+  const colorTokens = Colors[theme];
   // 使用 dayjs：当月日期与默认选中“今天”
   const days = getMonthDaysZh();
   const [selectedIndex, setSelectedIndex] = useState(getTodayIndexInMonth());
@@ -104,8 +107,8 @@ export default function ExploreScreen() {
 
 
   return (
-    <View style={styles.container}>
-      <SafeAreaView style={styles.safeArea}>
+    <View style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
+      <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
         <ScrollView
           style={styles.scrollView}
           contentContainerStyle={{ paddingBottom: bottomPadding }}

app/(tabs)/index.tsx

@@ -2,28 +2,25 @@ import { PlanCard } from '@/components/PlanCard';
 import { SearchBox } from '@/components/SearchBox';
 import { ThemedText } from '@/components/ThemedText';
 import { ThemedView } from '@/components/ThemedView';
+import { Colors } from '@/constants/Colors';
+import { useColorScheme } from '@/hooks/useColorScheme';
 // Removed WorkoutCard import since we no longer use the horizontal carousel
+import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { getChineseGreeting } from '@/utils/date';
 import { useRouter } from 'expo-router';
-import React, { useEffect, useRef } from 'react';
+import React from 'react';
 import { Pressable, SafeAreaView, ScrollView, StyleSheet, View } from 'react-native';
 
 // 移除旧的“热门活动”滑动数据，改为固定的“热点功能”卡片
 
 export default function HomeScreen() {
   const router = useRouter();
-  const hasOpenedLoginRef = useRef(false);
-
-  useEffect(() => {
-    // 仅在本次会话首次进入首页时打开登录页，可返回关闭
-    if (!hasOpenedLoginRef.current) {
-      hasOpenedLoginRef.current = true;
-      router.push('/auth/login');
-    }
-  }, [router]);
+  const { pushIfAuthedElseLogin } = useAuthGuard();
+  const theme = (useColorScheme() ?? 'light') as 'light' | 'dark';
+  const colorTokens = Colors[theme];
   return (
-    <SafeAreaView style={styles.safeArea}>
-      <ThemedView style={styles.container}>
+    <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
+      <ThemedView style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
         <ScrollView showsVerticalScrollIndicator={false}>
           {/* Header Section */}
           <View style={styles.header}>
@@ -52,7 +49,7 @@ export default function HomeScreen() {
 
               <Pressable
                 style={[styles.featureCard, styles.featureCardSecondary]}
-                onPress={() => router.push('/health-consultation' as any)}
+                onPress={() => router.push('/ai-coach-chat?name=Sarah' as any)}
               >
                 <ThemedText style={styles.featureTitle}>在线教练</ThemedText>
                 <ThemedText style={styles.featureSubtitle}>认证教练 · 1对1即时解答</ThemedText>
@@ -75,15 +72,33 @@ export default function HomeScreen() {
                 level="初学者"
                 progress={0}
               />
-            <Pressable onPress={() => router.push('/challenge')}>
-              <PlanCard
-                image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
-                title="30日训练打卡"
-                subtitle="坚持30天，养成训练习惯"
-                level="初学者"
-                progress={0.75}
-              />
-            </Pressable>
+              <Pressable onPress={() => pushIfAuthedElseLogin('/challenge')}>
+                <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"
+                  level="初学者"
+                  progress={0.75}
+                />
+              </Pressable>
+              <Pressable onPress={() => pushIfAuthedElseLogin('/training-plan')}>
+                <PlanCard
+                  image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
+                  title="训练计划制定"
+                  subtitle="按周安排/次数·常见目标·个性化选项"
+                  level="初学者"
+                  progress={0}
+                />
+              </Pressable>
+              <Pressable onPress={() => pushIfAuthedElseLogin('/checkin')}>
+                <PlanCard
+                  image={'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Image30play@2x.png'}
+                  title="每日打卡（自选动作）"
+                  subtitle="选择动作，设置组数/次数，记录完成"
+                  level="初学者"
+                  progress={0}
+                />
+              </Pressable>
             </View>
           </View>
 

app/(tabs)/personal.tsx

@@ -22,6 +22,8 @@ export default function PersonalScreen() {
   const [notificationEnabled, setNotificationEnabled] = useState(true);
   const colorScheme = useColorScheme();
   const colors = Colors[colorScheme ?? 'light'];
+  const theme = (colorScheme ?? 'light') as 'light' | 'dark';
+  const colorTokens = Colors[theme];
 
   type UserProfile = {
     fullName?: string;
@@ -287,11 +289,11 @@ export default function PersonalScreen() {
   ];
 
   return (
-    <View style={styles.container}>
+    <View style={[styles.container, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
       <StatusBar barStyle="dark-content" backgroundColor="transparent" translucent />
-      <SafeAreaView style={styles.safeArea}>
+      <SafeAreaView style={[styles.safeArea, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}>
         <ScrollView
-          style={styles.scrollView}
+          style={[styles.scrollView, { backgroundColor: theme === 'light' ? colorTokens.pageBackgroundEmphasis : colorTokens.background }]}
           contentContainerStyle={{ paddingBottom: bottomPadding }}
           showsVerticalScrollIndicator={false}
         >