refactor(database): migrate to new modular database layer and unify data access

- Remove legacy database.ts, LocalDataSource.ts, and MessageRepository.ts
- Create new src/database/ module with messageRepository, userCacheRepository, conversationRepository, and groupCacheRepository
- Update all consumers to import from @/database instead of services/database
- Add web platform blur handling for modal components to fix focus issues
- Flatten SystemMessageItem and NotificationsScreen styles for consistent design
- Add draggable slider in ChatSettingsScreen and dynamic font size support
- Introduce 9 new chat color themes
- Add profile screens for about, terms, and privacy policy with navigation routes
- Add policy links to login and registration screens
- Fix post share URL format from /posts/ to /post/

src/screens/message/components/ChatScreen/EmojiPanel.tsx

@@ -5,7 +5,7 @@
  */
 
 import React, { useState, useEffect, useCallback, useMemo } from 'react';
-import { View, TouchableOpacity, ActivityIndicator, Modal, Alert, Dimensions, StyleSheet, FlatList, ListRenderItem, ScrollView } from 'react-native';
+import { View, TouchableOpacity, ActivityIndicator, Modal, Alert, Dimensions, StyleSheet, FlatList, ListRenderItem, ScrollView, Platform } from 'react-native';
 import { Image as ExpoImage } from 'expo-image';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import * as ImagePicker from 'expo-image-picker';
@@ -18,6 +18,12 @@ import { useAppColors, spacing } from '../../../../theme';
 
 const { height: SCREEN_HEIGHT } = Dimensions.get('window');
 
+const blurActiveElementOnWeb = () => {
+  if (Platform.OS !== 'web') return;
+  const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
+  active?.blur?.();
+};
+
 // 表情尺寸配置 - 固定宽度 40px，使用 flex 布局
 const EMOJI_SIZES = {
   mobile: { size: 24, itemWidth: 40, itemHeight: 40 },
@@ -176,6 +182,7 @@ export const EmojiPanel: React.FC<EmojiPanelProps> = ({
 
   // 打开管理界面
   const handleOpenManage = () => {
+    blurActiveElementOnWeb();
     setShowManageModal(true);
     setManageMode(false);
     setSelectedStickers(new Set());