feat: 优化数据加载逻辑，添加应用状态监听以刷新统计数据；为步数卡片添加动画效果

app/(tabs)/statistics.tsx

@@ -26,6 +26,7 @@ import dayjs from 'dayjs';
 import { LinearGradient } from 'expo-linear-gradient';
 import React, { useEffect, useMemo, useRef, useState } from 'react';
 import {
+  AppState,
   SafeAreaView,
   ScrollView,
   StyleSheet,
@@ -240,20 +241,42 @@ export default function ExploreScreen() {
     }
   };
 
+  // 加载所有数据的统一方法
+  const loadAllData = React.useCallback((targetDate?: Date) => {
+    const dateToUse = targetDate || getCurrentSelectedDate();
+    if (dateToUse) {
+      loadHealthData(dateToUse);
+      if (isLoggedIn) {
+        loadNutritionData(dateToUse);
+        loadMoodData(dateToUse);
+      }
+    }
+  }, [isLoggedIn]);
+
   useFocusEffect(
     React.useCallback(() => {
-      // 聚焦时按当前选中的日期加载，避免与用户手动选择的日期不一致
-      const currentDate = currentSelectedDate;
-      if (currentDate) {
-        loadHealthData(currentDate);
-        if (isLoggedIn) {
-          loadNutritionData(currentDate);
-          loadMoodData(currentDate);
-        }
-      }
-    }, [selectedIndex])
+      // 每次聚焦时都拉取当前选中日期的最新数据
+      loadAllData();
+    }, [loadAllData])
   );
 
+  // AppState 监听：应用从后台返回前台时刷新数据
+  useEffect(() => {
+    const handleAppStateChange = (nextAppState: string) => {
+      if (nextAppState === 'active') {
+        // 应用从后台返回前台，刷新当前选中日期的数据
+        console.log('应用从后台返回前台，刷新统计数据...');
+        loadAllData();
+      }
+    };
+
+    const subscription = AppState.addEventListener('change', handleAppStateChange);
+
+    return () => {
+      subscription?.remove();
+    };
+  }, [loadAllData]);
+
   useEffect(() => {
     // 注册任务
     registerTask({
@@ -272,11 +295,7 @@ export default function ExploreScreen() {
   // 日期点击时，加载对应日期数据
   const onSelectDate = (index: number, date: Date) => {
     setSelectedIndex(index);
-    loadHealthData(date);
-    if (isLoggedIn) {
-      loadNutritionData(date);
-      loadMoodData(date);
-    }
+    loadAllData(date);
   };