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)/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,