feat: 更新多个组件以使用 SafeAreaView

- 在 goals-list、task-list、explore、personal、challenge/day 和 challenge/index 组件中引入 SafeAreaView，确保内容在安全区域内显示
- 移除不必要的 SafeAreaView 导入，优化代码结构
- 更新相关样式，提升用户体验和界面一致性

app/challenge/day.tsx

@@ -5,7 +5,8 @@ import { completeDay, setCustom } from '@/store/challengeSlice';
 import type { Exercise, ExerciseCustomConfig } from '@/utils/pilatesPlan';
 import { useLocalSearchParams, useRouter } from 'expo-router';
 import React, { useState } from 'react';
-import { FlatList, SafeAreaView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+import { FlatList, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
 
 export default function ChallengeDayScreen() {
   const { day } = useLocalSearchParams<{ day: string }>();