feat: 更新标签页和新增统计页面

- 修改标签页的名称和图标，将“探索”改为“统计”，并更新相关逻辑
- 新增统计页面，展示用户健康数据和历史记录
- 优化首页布局，调整组件显示，提升用户体验
- 删除不再使用的代码，简化项目结构

app/(tabs)/index.tsx

@@ -12,7 +12,6 @@ import { loadPlans } from '@/store/trainingPlanSlice';
 // Removed WorkoutCard import since we no longer use the horizontal carousel
 import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { TrainingPlan } from '@/services/trainingPlanApi';
-import { getChineseGreeting } from '@/utils/date';
 import { useRouter } from 'expo-router';
 import React from 'react';
 import { Animated, Image, PanResponder, Pressable, SafeAreaView, ScrollView, StyleSheet, useWindowDimensions, View } from 'react-native';
@@ -260,10 +259,10 @@ export default function HomeScreen() {
         </View>
         <ScrollView showsVerticalScrollIndicator={false}>
           {/* Header Section */}
-          <View style={styles.header}>
+          {/* <View style={styles.header}>
             <ThemedText style={styles.greeting}>{getChineseGreeting()}</ThemedText>
-            <ThemedText style={styles.userName}>新学员，欢迎你</ThemedText>
-          </View>
+            <ThemedText style={styles.userName}></ThemedText>
+          </View> */}
 
           {/* Search Box */}
           <SearchBox placeholder="搜索" />
@@ -274,16 +273,16 @@ export default function HomeScreen() {
 
             <View style={styles.featureGrid}>
 
-            <Pressable
+              <Pressable
                 style={[styles.featureCard, styles.featureCardQuinary]}
                 onPress={() => pushIfAuthedElseLogin('/workout/today')}
               >
                 <View style={styles.featureIconWrapper}>
                   <View style={styles.featureIconPlaceholder}>
-                  <Image
-                    source={require('@/assets/images/icons/iconWorkout.png')}
-                    style={styles.featureIconImage}
-                  />
+                    <Image
+                      source={require('@/assets/images/icons/iconWorkout.png')}
+                      style={styles.featureIconImage}
+                    />
                   </View>
                 </View>
                 <ThemedText style={styles.featureTitle}>训练</ThemedText>
@@ -308,17 +307,17 @@ export default function HomeScreen() {
               >
                 <View style={styles.featureIconWrapper}>
                   <View style={styles.featureIconPlaceholder}>
-                  <Image
-                    source={require('@/assets/images/icons/iconPlan.png')}
-                    style={styles.featureIconImage}
-                  />
+                    <Image
+                      source={require('@/assets/images/icons/iconPlan.png')}
+                      style={styles.featureIconImage}
+                    />
                   </View>
                 </View>
                 <ThemedText style={styles.featureTitle}>计划</ThemedText>
               </Pressable>
 
 
-       
+
             </View>
           </View>