feat: 更新教练页面和布局，优化用户体验

- 将教练页面中的“Bot”名称更改为“Seal”，提升品牌一致性
- 在布局文件中调整标签标题和图标，确保与新名称一致
- 新增使用次数显示功能，优化用户对使用情况的了解
- 更新日期选择器样式，增强未来日期的禁用效果
- 优化压力分析模态框的颜色和文本，提升可读性

app/(tabs)/_layout.tsx

@@ -43,7 +43,7 @@ export default function TabLayout() {
                 case 'explore':
                   return { icon: 'magnifyingglass.circle.fill', title: '发现' } as const;
                 case 'coach':
-                  return { icon: 'person.3.fill', title: 'Bot' } as const;
+                  return { icon: 'person.3.fill', title: 'Seal' } as const;
                 case 'statistics':
                   return { icon: 'chart.pie.fill', title: '统计' } as const;
                 case 'personal':
@@ -131,7 +131,7 @@ export default function TabLayout() {
       <Tabs.Screen
         name="coach"
         options={{
-          title: 'Bot',
+          title: 'Seal',
           tabBarIcon: ({ color }) => {
             const isCoachSelected = pathname === '/coach';
             return (
@@ -148,7 +148,7 @@ export default function TabLayout() {
                       textAlign: 'center',
                       flexShrink: 0,
                     }}>
-                    Bot
+                    Seal
                   </Text>
                 )}
               </View>
@@ -160,6 +160,7 @@ export default function TabLayout() {
         name="explore"
         options={{
           title: '发现',
+          href: null,
           tabBarIcon: ({ color }) => {
             const isHomeSelected = pathname === '/' || pathname === '/index';
             return (

app/(tabs)/coach.tsx

@@ -25,12 +25,13 @@ import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 import { Colors } from '@/constants/Colors';
 import { getTabBarBottomPadding } from '@/constants/TabBar';
-import { useAppSelector } from '@/hooks/redux';
+import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { useCosUpload } from '@/hooks/useCosUpload';
 import { deleteConversation, getConversationDetail, listConversations, type AiConversationListItem } from '@/services/aiCoach';
 import { loadAiCoachSessionCache, saveAiCoachSessionCache } from '@/services/aiCoachSession';
 import { api, getAuthToken, postTextStream } from '@/services/api';
+import { updateProfile } from '@/store/userSlice';
 import dayjs from 'dayjs';
 import { LinearGradient } from 'expo-linear-gradient';
 import { ActionSheet } from '../../components/ui/ActionSheet';
@@ -124,7 +125,7 @@ export default function CoachScreen() {
   const { isLoggedIn, pushIfAuthedElseLogin } = useAuthGuard();
   // 为了让页面更贴近品牌主题与更亮的观感，这里使用亮色系配色
   const theme = Colors.light;
-  const botName = (params?.name || 'Bot').toString();
+  const botName = (params?.name || 'Seal').toString();
   const [input, setInput] = useState('');
   const [isSending, setIsSending] = useState(false);
   const [isStreaming, setIsStreaming] = useState(false);
@@ -174,7 +175,7 @@ export default function CoachScreen() {
   const generateWelcomeMessage = useCallback(() => {
     const hour = new Date().getHours();
     const name = userProfile?.name || '朋友';
-    const botName = (params?.name || '海豹助手').toString();
+    const botName = (params?.name || 'Seal').toString();
 
     // 时段问候
     let timeGreeting = '';
@@ -199,7 +200,7 @@ export default function CoachScreen() {
         messages: [
           `${timeGreeting}，${name}！我是${botName}，你的专属健康管理助手。新的一天开始了，让我们一起为你的健康目标努力吧！`,
           `${timeGreeting}！早晨是制定健康计划的最佳时机，我是${botName}，可以帮你管理营养摄入、运动计划和生活作息。`,
-          `${timeGreeting}，${name}！作为你的海豹助手，我很高兴能陪伴你的健康之旅。无论是饮食营养、健身锻炼还是生活管理，我都能为你提供专业建议。`
+          `${timeGreeting}，${name}！作为你的Seal，我很高兴能陪伴你的健康之旅。无论是饮食营养、健身锻炼还是生活管理，我都能为你提供专业建议。`
         ]
       },
       {
@@ -215,7 +216,7 @@ export default function CoachScreen() {
         messages: [
           `${timeGreeting}，${name}！午餐时间很关键呢，合理的营养搭配能为下午提供充足能量。我是${botName}，可以为你分析饮食营养和热量管理。`,
           `${timeGreeting}！忙碌的上午结束了，该关注一下身体需求啦。我是你的健康助手${botName}，无论是饮食调整、运动安排还是休息建议，都可以找我。`,
-          `${timeGreeting}，${name}！午间是调整状态的好时机。作为你的海豹助手，我建议关注饮食均衡和适度放松～`
+          `${timeGreeting}，${name}！午间是调整状态的好时机。作为你的Seal，我建议关注饮食均衡和适度放松～`
         ]
       },
       {
@@ -231,7 +232,7 @@ export default function CoachScreen() {
         messages: [
           `${timeGreeting}，${name}！忙碌了一天，现在是时候关注身心平衡了。我是${botName}，可以为你提供放松建议、营养补充和恢复方案。`,
           `${timeGreeting}！夜幕降临，这是一天中最适合总结和调整的时刻。我是你的健康伙伴${botName}，让我们一起回顾今天的健康表现，规划明天的目标。`,
-          `${timeGreeting}，${name}！晚间时光属于你自己，也是关爱身体的珍贵时间。作为你的海豹助手，我想陪你聊聊如何更好地管理健康生活。`
+          `${timeGreeting}，${name}！晚间时光属于你自己，也是关爱身体的珍贵时间。作为你的Seal，我想陪你聊聊如何更好地管理健康生活。`
         ]
       },
       {
@@ -252,7 +253,7 @@ export default function CoachScreen() {
       },
       {
         condition: () => userProfile && (!userProfile.pilatesPurposes || userProfile.pilatesPurposes.length === 0),
-        message: `${timeGreeting}，${name}！作为你的海豹助手，我想更好地了解你的健康需求。告诉我你希望在营养摄入、身材管理、健身锻炼或生活管理方面实现什么目标吧～`
+        message: `${timeGreeting}，${name}！作为你的Seal，我想更好地了解你的健康需求。告诉我你希望在营养摄入、身材管理、健身锻炼或生活管理方面实现什么目标吧～`
       }
     ];
 
@@ -1236,7 +1237,7 @@ export default function CoachScreen() {
             </TouchableOpacity>
           </View>
 
-          <Text style={{ color: '#687076', fontSize: 12 }}>选择合适的方式记录您的饮食，海豹助手会根据您的饮食情况给出专业的营养建议。</Text>
+          <Text style={{ color: '#687076', fontSize: 12 }}>选择合适的方式记录您的饮食，Seal会根据您的饮食情况给出专业的营养建议。</Text>
         </View>
       );
     }
@@ -1278,7 +1279,7 @@ export default function CoachScreen() {
             <Text style={{ color: '#192126', fontWeight: '700' }}>发送记录</Text>
           </TouchableOpacity>
 
-          <Text style={{ color: '#687076', fontSize: 12 }}>详细描述您的饮食内容和分量，有助于海豹助手给出更精准的营养分析和建议。</Text>
+          <Text style={{ color: '#687076', fontSize: 12 }}>详细描述您的饮食内容和分量，有助于Seal给出更精准的营养分析和建议。</Text>
         </View>
       );
     }
@@ -1825,7 +1826,32 @@ export default function CoachScreen() {
           if (h && Math.abs(h - headerHeight) > 0.5) setHeaderHeight(h);
         }}
       >
-        <Text style={[styles.headerTitle, { color: theme.text }]}>{botName}</Text>
+        <View style={styles.headerLeft}>
+          <Text style={[styles.headerTitle, { color: theme.text }]}>{botName}</Text>
+
+          {/* 使用次数显示 */}
+          <TouchableOpacity
+            style={styles.usageCountContainer}
+            onPress={() => {
+              // 临时测试：切换VIP状态
+              const dispatch = useAppDispatch();
+              dispatch(updateProfile({
+                isVip: !userProfile?.isVip,
+                freeUsageCount: userProfile?.isVip ? 3 : 5,
+                maxUsageCount: userProfile?.isVip ? 5 : 10
+              }));
+            }}
+          >
+            <Image
+              source={require('@/assets/images/icons/iconFlash.png')}
+              style={styles.usageIcon}
+            />
+            <Text style={[styles.usageText, { color: theme.text }]}>
+              {userProfile?.isVip ? '不限' : `${userProfile?.freeUsageCount || 0}/${userProfile?.maxUsageCount || 0}`}
+            </Text>
+          </TouchableOpacity>
+        </View>
+
         <View style={styles.headerActions}>
           <TouchableOpacity
             accessibilityRole="button"
@@ -2083,6 +2109,11 @@ const styles = StyleSheet.create({
     paddingHorizontal: 16,
     paddingBottom: 10,
   },
+  headerLeft: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 12,
+  },
   headerTitle: {
     fontSize: 20,
     fontWeight: '800',
@@ -2809,6 +2840,24 @@ const styles = StyleSheet.create({
     fontWeight: '700',
     color: '#FFFFFF',
   },
+  usageCountContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 4,
+    paddingHorizontal: 8,
+    paddingVertical: 4,
+    borderRadius: 12,
+    backgroundColor: 'rgba(0,0,0,0.06)',
+  },
+  usageIcon: {
+    width: 16,
+    height: 16,
+  },
+  usageText: {
+    fontSize: 12,
+    fontWeight: '600',
+    color: '#687076',
+  },
 });
 
 const markdownStyles = {

app/(tabs)/statistics.tsx

@@ -13,7 +13,6 @@ import { useColorScheme } from '@/hooks/useColorScheme';
 import { calculateNutritionSummary, getDietRecords, NutritionSummary } from '@/services/dietRecords';
 import { getMonthDaysZh, getMonthTitleZh, getTodayIndexInMonth } from '@/utils/date';
 import { ensureHealthPermissions, fetchHealthDataForDate } from '@/utils/health';
-import { Ionicons } from '@expo/vector-icons';
 import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';
 import { useFocusEffect } from '@react-navigation/native';
 import dayjs from 'dayjs';
@@ -271,15 +270,29 @@ export default function ExploreScreen() {
           >
             {days.map((d, i) => {
               const selected = i === selectedIndex;
+              const isFutureDate = d.date.isAfter(dayjs(), 'day');
               return (
                 <View key={`${d.dayOfMonth}`} style={styles.dayItemWrapper}>
                   <TouchableOpacity
-                    style={[styles.dayPill, selected ? styles.dayPillSelected : styles.dayPillNormal]}
-                    onPress={() => onSelectDate(i)}
-                    activeOpacity={0.8}
+                    style={[
+                      styles.dayPill,
+                      selected ? styles.dayPillSelected : styles.dayPillNormal,
+                      isFutureDate && styles.dayPillDisabled
+                    ]}
+                    onPress={() => !isFutureDate && onSelectDate(i)}
+                    activeOpacity={isFutureDate ? 1 : 0.8}
+                    disabled={isFutureDate}
                   >
-                    <Text style={[styles.dayLabel, selected && styles.dayLabelSelected]}> {d.weekdayZh} </Text>
-                    <Text style={[styles.dayDate, selected && styles.dayDateSelected]}>{d.dayOfMonth}</Text>
+                    <Text style={[
+                      styles.dayLabel,
+                      selected && styles.dayLabelSelected,
+                      isFutureDate && styles.dayLabelDisabled
+                    ]}> {d.weekdayZh} </Text>
+                    <Text style={[
+                      styles.dayDate,
+                      selected && styles.dayDateSelected,
+                      isFutureDate && styles.dayDateDisabled
+                    ]}>{d.dayOfMonth}</Text>
                   </TouchableOpacity>
                   {selected && <View style={styles.selectedDot} />}
                 </View>
@@ -319,9 +332,6 @@ export default function ExploreScreen() {
 
               <View style={[styles.masonryCard, styles.stepsCard]}>
                 <View style={styles.cardHeaderRow}>
-                  <View style={styles.iconSquare}>
-                    <Ionicons name="footsteps-outline" size={18} color="#192126" />
-                  </View>
                   <Text style={styles.cardTitle}>步数</Text>
                 </View>
                 {stepCount != null ? (
@@ -367,9 +377,6 @@ export default function ExploreScreen() {
 
               <View style={[styles.masonryCard, styles.sleepCard]}>
                 <View style={styles.cardHeaderRow}>
-                  <View style={styles.iconSquare}>
-                    <Ionicons name="moon-outline" size={18} color="#192126" />
-                  </View>
                   <Text style={styles.cardTitle}>睡眠</Text>
                 </View>
                 {sleepDuration != null ? (
@@ -443,6 +450,10 @@ const styles = StyleSheet.create({
   dayPillSelected: {
     backgroundColor: lightColors.datePickerSelected,
   },
+  dayPillDisabled: {
+    backgroundColor: '#F5F5F5',
+    opacity: 0.5,
+  },
   dayLabel: {
     fontSize: 12,
     fontWeight: '700',
@@ -452,6 +463,9 @@ const styles = StyleSheet.create({
   dayLabelSelected: {
     color: '#FFFFFF',
   },
+  dayLabelDisabled: {
+    color: '#9AA3AE',
+  },
   dayDate: {
     fontSize: 12,
     fontWeight: '800',
@@ -460,6 +474,9 @@ const styles = StyleSheet.create({
   dayDateSelected: {
     color: '#FFFFFF',
   },
+  dayDateDisabled: {
+    color: '#9AA3AE',
+  },
   selectedDot: {
     width: 5,
     height: 5,