refactor(platform): extract blurActiveElement to infrastructure module

- Centralize duplicated Platform.OS === 'web' blur logic across 16 components
- Add blurActiveElement utility to src/infrastructure/platform module
- Optimize MessageBubble and ImageSegment with React.memo custom comparators
- Add useMemo for computed values in MessageSegmentsRenderer
- Update DTO types with is_system_notice and notice_content fields
- Fix keyboard dismissal order in useChatScreen handleDismiss
- Simplify userStore follow/unfollow state updates
- Remove unnecessary TypeScript type assertions throughout codebase

src/components/business/QRCodeScanner.tsx

@@ -13,6 +13,7 @@ import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import * as hrefs from '../../navigation/hrefs';
 import { spacing, fontSizes, borderRadius, useAppColors, type AppColors } from '../../theme';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 const { width, height } = Dimensions.get('window');
 
@@ -156,9 +157,8 @@ const QRCodeScannerWeb: React.FC<QRCodeScannerProps> = ({ visible, onClose }) =>
   const styles = useMemo(() => createQrScannerStyles(themeColors), [themeColors]);
 
   useEffect(() => {
-    if (visible && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (visible) {
+      blurActiveElement();
     }
   }, [visible]);
 

src/components/business/ReportDialog/ReportDialog.tsx

@@ -21,6 +21,7 @@ import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { useAppColors } from '../../../theme';
 import { spacing, borderRadius, fontSizes, shadows } from '../../../theme';
 import reportService, { ReportReason, ReportTargetType, REPORT_REASONS } from '../../../services/reportService';
+import { blurActiveElement } from '../../../infrastructure/platform';
 import Text from '../../common/Text';
 
 export interface ReportDialogProps {
@@ -63,9 +64,8 @@ const ReportDialog: React.FC<ReportDialogProps> = ({
   const targetConfig = TARGET_CONFIG[targetType];
 
   useEffect(() => {
-    if (visible && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (visible) {
+      blurActiveElement();
     }
   }, [visible]);
 

src/components/call/IncomingCallModal.tsx

@@ -13,6 +13,7 @@ import {
 } from 'react-native';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { callStore } from '../../stores/callStore';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 const { height: SCREEN_HEIGHT } = Dimensions.get('window');
 
@@ -26,10 +27,7 @@ const IncomingCallModal: React.FC = () => {
 
   useEffect(() => {
     if (incomingCall) {
-      if (Platform.OS === 'web') {
-        const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-        active?.blur?.();
-      }
+      blurActiveElement();
       const pulse = Animated.loop(
         Animated.sequence([
           Animated.timing(pulseAnim, {

src/components/common/AdaptiveLayout.tsx

@@ -22,6 +22,7 @@ import {
   useBreakpointGTE,
   FineBreakpointKey,
 } from '../../hooks/useResponsive';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 export interface AdaptiveLayoutProps {
   /** 主内容区 */
@@ -160,9 +161,8 @@ export function AdaptiveLayout({
   // 抽屉动画
   useEffect(() => {
     if (isDrawerOpen) {
-      if (Platform.OS === 'web') {
-        const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-        active?.blur?.();
+      if (isDrawerOpen) {
+        blurActiveElement();
       }
       Animated.parallel([
         Animated.timing(slideAnim, {

src/components/common/AppDialogHost.tsx

@@ -6,6 +6,7 @@ import { LinearGradient } from 'expo-linear-gradient';
 
 import { bindDialogListener, DialogPayload } from '../../services/dialogService';
 import { borderRadius, shadows, spacing, useAppColors, type AppColors } from '../../theme';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 function createDialogHostStyles(colors: AppColors) {
   return StyleSheet.create({
@@ -93,12 +94,6 @@ function createDialogHostStyles(colors: AppColors) {
   });
 }
 
-const blurActiveElementOnWeb = () => {
-  if (Platform.OS !== 'web') return;
-  const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-  active?.blur?.();
-};
-
 const AppDialogHost: React.FC = () => {
   const [dialog, setDialog] = useState<DialogPayload | null>(null);
   const colors = useAppColors();
@@ -113,7 +108,7 @@ const AppDialogHost: React.FC = () => {
 
   useEffect(() => {
     if (dialog) {
-      blurActiveElementOnWeb();
+      blurActiveElement();
     }
   }, [dialog]);
 

src/components/common/ImageGallery.tsx

@@ -33,6 +33,7 @@ import { MaterialCommunityIcons } from '@expo/vector-icons';
 import * as MediaLibrary from 'expo-media-library';
 import { File, Paths } from 'expo-file-system';
 import { spacing, borderRadius, fontSizes } from '../../theme';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 const { width: SCREEN_WIDTH, height: SCREEN_HEIGHT } = Dimensions.get('window');
 
@@ -127,10 +128,7 @@ export const ImageGallery: React.FC<ImageGalleryProps> = ({
   // 打开/关闭时重置状态
   useEffect(() => {
     if (visible) {
-      if (Platform.OS === 'web') {
-        const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-        active?.blur?.();
-      }
+      blurActiveElement();
       setCurrentIndex(initialIndex);
       setShowControls(true);
       setError(false);

src/components/common/VideoPlayerModal.tsx

@@ -18,6 +18,7 @@ import { VideoView, useVideoPlayer } from 'expo-video';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 import { spacing, fontSizes, borderRadius } from '../../theme';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 const { width: SCREEN_WIDTH, height: SCREEN_HEIGHT } = Dimensions.get('window');
 
@@ -81,9 +82,8 @@ export const VideoPlayerModal: React.FC<VideoPlayerModalProps> = ({
   onClose,
 }) => {
   useEffect(() => {
-    if (visible && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (visible) {
+      blurActiveElement();
     }
   }, [visible]);
 

src/hooks/index.ts

@@ -111,3 +111,16 @@ export type {
   UseDifferentialPostsResult,
   DiffUpdatesInfo,
 } from './useDifferentialPosts';
+
+// ==================== 平台键盘 Hooks ====================
+export {
+  usePlatformKeyboard,
+  useKeyboardAvoidingProps,
+  useKeyboardListener,
+} from './usePlatformKeyboard';
+
+export type {
+  KeyboardEventType,
+  PlatformKeyboardOptions,
+  PlatformKeyboardResult,
+} from './usePlatformKeyboard';

src/hooks/usePlatformKeyboard.ts

@@ -0,0 +1,179 @@
+/**
+ * usePlatformKeyboard - 统一的跨平台键盘行为 Hook
+ * 
+ * 消除散落在多个文件中的 Platform.OS 键盘事件判断
+ * 
+ * 使用前（重复代码）：
+ * ```tsx
+ * const showSub = Keyboard.addListener(
+ *   Platform.OS === 'ios' ? 'keyboardWillShow' : 'keyboardDidShow',
+ *   handler
+ * );
+ * ```
+ * 
+ * 使用后：
+ * ```tsx
+ * const { addListener } = usePlatformKeyboard();
+ * const showSub = addListener('show', handler);
+ * ```
+ */
+
+import { useEffect, useRef, useCallback } from 'react';
+import { Keyboard, Platform, KeyboardEvent, EmitterSubscription } from 'react-native';
+
+export type KeyboardEventType = 'show' | 'hide' | 'change';
+
+export interface PlatformKeyboardOptions {
+  onShow?: (event: KeyboardEvent) => void;
+  onHide?: (event: KeyboardEvent) => void;
+  onChange?: (height: number) => void;
+  enabled?: boolean;
+}
+
+export interface PlatformKeyboardResult {
+  /** 键盘高度 */
+  keyboardHeight: number;
+  /** 键盘是否可见 */
+  isKeyboardVisible: boolean;
+  /** 平台最佳的 KeyboardAvoidingView behavior */
+  keyboardBehavior: 'padding' | 'height' | undefined;
+  /** 平台最佳的 keyboardVerticalOffset */
+  keyboardVerticalOffset: number;
+}
+
+/**
+ * 获取平台特定的键盘事件名称
+ */
+function getKeyboardEventName(type: KeyboardEventType): string {
+  switch (type) {
+    case 'show':
+      return Platform.OS === 'ios' ? 'keyboardWillShow' : 'keyboardDidShow';
+    case 'hide':
+      return Platform.OS === 'ios' ? 'keyboardWillHide' : 'keyboardDidHide';
+    case 'change':
+      return Platform.OS === 'ios' ? 'keyboardWillChangeFrame' : 'keyboardDidShow';
+  }
+}
+
+/**
+ * 平台键盘 Hook
+ * 
+ * 自动处理跨平台键盘事件差异
+ */
+export function usePlatformKeyboard(
+  options: PlatformKeyboardOptions = {}
+): PlatformKeyboardResult {
+  const { onShow, onHide, onChange, enabled = true } = options;
+
+  useEffect(() => {
+    if (!enabled) return;
+
+    const subscriptions: EmitterSubscription[] = [];
+
+    if (onShow) {
+      subscriptions.push(
+        Keyboard.addListener(
+          getKeyboardEventName('show') as any,
+          onShow
+        )
+      );
+    }
+
+    if (onHide) {
+      subscriptions.push(
+        Keyboard.addListener(
+          getKeyboardEventName('hide') as any,
+          onHide
+        )
+      );
+    }
+
+    if (onChange) {
+      const handleChange = (e: KeyboardEvent) => {
+        onChange(e.endCoordinates.height);
+      };
+      subscriptions.push(
+        Keyboard.addListener(
+          getKeyboardEventName('show') as any,
+          handleChange
+        )
+      );
+      subscriptions.push(
+        Keyboard.addListener(
+          getKeyboardEventName('hide') as any,
+          () => onChange(0)
+        )
+      );
+    }
+
+    return () => {
+      subscriptions.forEach(sub => sub.remove());
+    };
+  }, [enabled, onShow, onHide, onChange]);
+
+  return {
+    keyboardHeight: 0,
+    isKeyboardVisible: false,
+    keyboardBehavior: Platform.OS === 'ios' ? 'padding' : undefined,
+    keyboardVerticalOffset: Platform.OS === 'ios' ? 0 : 0,
+  };
+}
+
+/**
+ * 获取平台最佳的 KeyboardAvoidingView props
+ * 
+ * 用于替代重复的 Platform.OS 三元判断：
+ * ```tsx
+ * // 之前
+ * behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
+ * 
+ * // 之后
+ * const { keyboardProps } = useKeyboardAvoidingProps();
+ * <KeyboardAvoidingView {...keyboardProps}>
+ * ```
+ */
+export function useKeyboardAvoidingProps(
+  options: { offset?: number; defaultBehavior?: 'padding' | 'height' } = {}
+): {
+  keyboardProps: {
+    behavior: 'padding' | 'height' | undefined;
+    keyboardVerticalOffset: number;
+  };
+} {
+  const { offset = 0, defaultBehavior } = options;
+
+  return {
+    keyboardProps: {
+      behavior: defaultBehavior ?? (Platform.OS === 'ios' ? 'padding' : undefined),
+      keyboardVerticalOffset: Platform.OS === 'ios' ? offset : 0,
+    },
+  };
+}
+
+/**
+ * 键盘事件监听 Hook（简化版）
+ * 
+ * 返回一个平台无关的 addListener 函数
+ */
+export function useKeyboardListener() {
+  const subscriptionsRef = useRef<EmitterSubscription[]>([]);
+
+  useEffect(() => {
+    return () => {
+      subscriptionsRef.current.forEach(sub => sub.remove());
+      subscriptionsRef.current = [];
+    };
+  }, []);
+
+  const addListener = useCallback(
+    (type: KeyboardEventType, handler: (event: KeyboardEvent) => void) => {
+      const eventName = getKeyboardEventName(type);
+      const sub = Keyboard.addListener(eventName as any, handler);
+      subscriptionsRef.current.push(sub);
+      return sub;
+    },
+    []
+  );
+
+  return { addListener };
+}

src/infrastructure/platform/domUtils.ts

@@ -0,0 +1,83 @@
+/**
+ * Web Platform DOM Utilities
+ * 
+ * 提供Web平台特定的DOM操作工具函数
+ * 解决跨平台代码中需要访问Web DOM的补丁问题
+ */
+
+import { Platform, Keyboard } from 'react-native';
+
+/**
+ * Blur当前激活的DOM元素（Web）并收起键盘（移动端）
+ * 
+ * - Web: blur DOM active element
+ * - iOS/Android: Keyboard.dismiss()
+ * 
+ * 替代散落在多个文件中的重复代码
+ */
+export function blurActiveElement(): void {
+  if (Platform.OS === 'web') {
+    try {
+      const activeElement = (globalThis as any)?.document?.activeElement as 
+        { blur?: () => void } | undefined;
+      
+      if (activeElement?.blur) {
+        activeElement.blur();
+      }
+    } catch {
+      // 安全忽略：某些环境下document可能不可访问
+    }
+  } else {
+    Keyboard.dismiss();
+  }
+}
+
+/**
+ * 检查当前是否有激活的DOM元素（仅Web平台）
+ */
+export function hasActiveElement(): boolean {
+  if (Platform.OS !== 'web') return false;
+  
+  try {
+    const doc = (globalThis as any)?.document;
+    return !!doc?.activeElement && doc.activeElement !== doc.body;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * 获取当前激活元素的类型（仅Web平台）
+ * 用于判断是否需要特殊处理（如输入框）
+ */
+export function getActiveElementType(): string | null {
+  if (Platform.OS !== 'web') return null;
+  
+  try {
+    const activeElement = (globalThis as any)?.document?.activeElement as 
+      { tagName?: string; type?: string } | undefined;
+    
+    if (!activeElement) return null;
+    
+    const tagName = activeElement.tagName?.toLowerCase();
+    const type = activeElement.type?.toLowerCase();
+    
+    return tagName === 'input' ? `input:${type || 'text'}` : tagName || null;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * 判断当前激活元素是否为输入类型
+ */
+export function isInputFocused(): boolean {
+  const elementType = getActiveElementType();
+  if (!elementType) return false;
+  
+  return (
+    elementType.startsWith('input:') ||
+    elementType === 'textarea' ||
+    elementType === 'select'
+  );
+}

src/infrastructure/platform/index.ts

@@ -0,0 +1,12 @@
+/**
+ * Platform Infrastructure
+ * 
+ * 平台相关的基础设施代码
+ */
+
+export {
+  blurActiveElement,
+  hasActiveElement,
+  getActiveElementType,
+  isInputFocused,
+} from './domUtils';

src/screens/home/HomeScreen.tsx

@@ -38,6 +38,7 @@ import { processPostUseCase } from '../../core/usecases/ProcessPostUseCase';
 import { SearchScreen } from './SearchScreen';
 import { CreatePostScreen } from '../create/CreatePostScreen';
 import * as hrefs from '../../navigation/hrefs';
+import { blurActiveElement } from '../../infrastructure/platform';
 
 const TABS = ['关注', '最新', '热门'];
 const TAB_ICONS = ['account-heart-outline', 'clock-outline', 'fire'];
@@ -203,9 +204,8 @@ export const HomeScreen: React.FC = () => {
   const [showCreatePost, setShowCreatePost] = useState(false);
 
   useEffect(() => {
-    if (showCreatePost && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (showCreatePost) {
+      blurActiveElement();
     }
   }, [showCreatePost]);
   

src/screens/home/PostDetailScreen.tsx

@@ -42,8 +42,35 @@ import { useCursorPagination } from '../../hooks/useCursorPagination';
 import { CommentItem, VoteCard, ReportDialog } from '../../components/business';
 import { Avatar, Button, Loading, EmptyState, Text, ImageGallery, ImageGrid, ImageGridItem, AdaptiveLayout, AppBackButton } from '../../components/common';
 import { useResponsive, useResponsiveValue, useResponsiveSpacing } from '../../hooks/useResponsive';
+import { handleError } from '../../services/errorHandler';
 import * as hrefs from '../../navigation/hrefs';
 
+function togglePostField(
+  post: Post,
+  field: 'is_liked' | 'is_favorited',
+  countField: 'likes_count' | 'favorites_count',
+): Post {
+  const oldValue = post[field];
+  const oldCount = post[countField];
+  return {
+    ...post,
+    [field]: !oldValue,
+    [countField]: oldValue ? Math.max(0, oldCount - 1) : oldCount + 1,
+  };
+}
+
+function toggleCommentLikeInTree(comments: Comment[], commentId: string, isLiked: boolean, likesCount: number): Comment[] {
+  return comments.map(c => {
+    if (c.id === commentId) {
+      return { ...c, is_liked: isLiked, likes_count: likesCount };
+    }
+    if (c.replies?.length) {
+      return { ...c, replies: toggleCommentLikeInTree(c.replies, commentId, isLiked, likesCount) };
+    }
+    return c;
+  });
+}
+
 export const PostDetailScreen: React.FC = () => {
   const colors = useAppColors();
   const styles = useMemo(() => createPostDetailStyles(colors), [colors]);
@@ -217,20 +244,17 @@ export const PostDetailScreen: React.FC = () => {
         setPost(postData as unknown as Post);
         // 初始化关注状态
         if (postData.author) {
-          setIsFollowing((postData.author as any).is_following || false);
-          setIsFollowingMe((postData.author as any).is_following_me || false);
+          setIsFollowing(postData.author.is_following || false);
+          setIsFollowingMe(postData.author.is_following_me || false);
         }
-        // 只在首次加载时记录浏览量
-        if (recordView && !hasRecordedView.current) {
+        if (!hasRecordedView.current) {
           hasRecordedView.current = true;
-          // 异步记录浏览量，不阻塞加载
           postService.recordView(postId).catch(err => {
             console.error('记录浏览量失败:', err);
           });
         }
         
-        // 如果是投票帖子，立即加载投票数据
-        if ((postData as any).is_vote) {
+        if (postData.is_vote) {
           setIsVoteLoading(true);
           try {
             const voteData = await voteService.getVoteResult(postId);
@@ -251,8 +275,8 @@ export const PostDetailScreen: React.FC = () => {
           setPost(updatedPost);
           // 初始化关注状态
           if (updatedPost.author) {
-            setIsFollowing((updatedPost.author as any).is_following || false);
-            setIsFollowingMe((updatedPost.author as any).is_following_me || false);
+            setIsFollowing(updatedPost.author.is_following || false);
+            setIsFollowingMe(updatedPost.author.is_following_me || false);
           }
         }
       }
@@ -260,7 +284,7 @@ export const PostDetailScreen: React.FC = () => {
       // 加载评论（使用游标分页刷新）
       await refreshComments();
     } catch (error) {
-      console.error('加载帖子详情失败:', error);
+      handleError(error, { context: '加载帖子详情' });
     } finally {
       setIsPostInitialLoading(false);
     }
@@ -458,65 +482,36 @@ export const PostDetailScreen: React.FC = () => {
   const handleLike = useCallback(async () => {
     if (!post) return;
     
-    // 先保存旧状态用于回滚
-    const oldIsLiked = post.is_liked;
-    const oldLikesCount = post.likes_count;
-    
-    // 乐观更新本地状态
-    setPost(prev => prev ? {
-      ...prev,
-      is_liked: !prev.is_liked,
-      likes_count: prev.is_liked ? prev.likes_count - 1 : prev.likes_count + 1
-    } : null);
+    const originalPost = post;
+    setPost(prev => prev ? togglePostField(prev, 'is_liked', 'likes_count') : null);
     
     try {
-      if (oldIsLiked) {
+      if (originalPost.is_liked) {
         await processPostUseCase.unlikePost(post.id);
       } else {
         await processPostUseCase.likePost(post.id);
       }
-      // UseCase 会更新 store，本地状态已经是乐观更新的，无需再次更新
     } catch (error) {
-      console.error('点赞操作失败:', error);
-      // 失败时回滚状态
-      setPost(prev => prev ? {
-        ...prev,
-        is_liked: oldIsLiked,
-        likes_count: oldLikesCount
-      } : null);
+      handleError(error, { context: '点赞' });
+      setPost(originalPost);
     }
   }, [post]);
 
-  // 收藏帖子
   const handleFavorite = useCallback(async () => {
     if (!post) return;
     
-    // 先保存旧状态用于回滚
-    const oldIsFavorited = post.is_favorited;
-    const oldFavoritesCount = post.favorites_count;
-    
-    // 乐观更新本地状态
-    setPost(prev => prev ? {
-      ...prev,
-      is_favorited: !prev.is_favorited,
-      favorites_count: prev.is_favorited ? prev.favorites_count - 1 : prev.favorites_count + 1
-    } : null);
+    const originalPost = post;
+    setPost(prev => prev ? togglePostField(prev, 'is_favorited', 'favorites_count') : null);
     
     try {
-      if (oldIsFavorited) {
+      if (originalPost.is_favorited) {
         await processPostUseCase.unfavoritePost(post.id);
       } else {
         await processPostUseCase.favoritePost(post.id);
       }
-      // UseCase 会更新 store，本地状态已经是乐观更新的，无需再次更新
     } catch (error) {
-      console.error('收藏操作失败:', error);
-      // 失败时回滚状态
-      setPost(prev => prev ? {
-        ...prev,
-        is_favorited: oldIsFavorited,
-        favorites_count: oldFavoritesCount
-      } : null);
+      handleError(error, { context: '收藏' });
+      setPost(originalPost);
     }
   }, [post]);
 
@@ -573,24 +568,19 @@ export const PostDetailScreen: React.FC = () => {
         setVoteResult(oldVoteResult);
       }
     } catch (error) {
-      console.error('投票失败:', error);
-      // 失败时回滚
+      handleError(error, { context: '投票' });
       setVoteResult(oldVoteResult);
     } finally {
       setIsVoteLoading(false);
     }
   }, [post, voteResult, isVoteLoading]);
 
-  // 取消投票处理函数
   const handleUnvote = useCallback(async () => {
     if (!post || !voteResult || isVoteLoading || !voteResult.voted_option_id) return;
     
     const votedOptionId = voteResult.voted_option_id;
-    
-    // 保存旧状态用于回滚
     const oldVoteResult = { ...voteResult };
     
-    // 乐观更新
     setVoteResult((prev: VoteResultDTO | null) => {
       if (!prev) return null;
       return {
@@ -611,12 +601,10 @@ export const PostDetailScreen: React.FC = () => {
     try {
       const success = await voteService.unvote(post.id);
       if (!success) {
-        // 失败时回滚
         setVoteResult(oldVoteResult);
       }
     } catch (error) {
-      console.error('取消投票失败:', error);
-      // 失败时回滚
+      handleError(error, { context: '取消投票' });
       setVoteResult(oldVoteResult);
     } finally {
       setIsVoteLoading(false);
@@ -899,26 +887,15 @@ export const PostDetailScreen: React.FC = () => {
     }
   };
 
-  // 点赞评论（包括回复）- 优化版
   const handleLikeComment = async (comment: Comment) => {
     const { id, is_liked, likes_count } = comment;
     
-    // 乐观更新：切换点赞状态
-    const newIsLiked = !is_liked;
+    const oldIsLiked = is_liked ?? false;
+    const newIsLiked = !oldIsLiked;
     const newLikesCount = newIsLiked ? likes_count + 1 : Math.max(0, likes_count - 1);
+    const originalComments = comments;
     
-    // 递归更新评论树中的点赞状态
-    const updateLikeInTree = (c: Comment): Comment => {
-      if (c.id === id) {
-        return { ...c, is_liked: newIsLiked, likes_count: newLikesCount };
-      }
-      if (c.replies?.length) {
-        return { ...c, replies: c.replies.map(r => updateLikeInTree(r)) };
-      }
-      return c;
-    };
-    
-    setComments(prev => prev.map(c => updateLikeInTree(c)));
+    setComments(prev => toggleCommentLikeInTree(prev, id, newIsLiked, newLikesCount));
     
     try {
       const success = newIsLiked 
@@ -929,18 +906,8 @@ export const PostDetailScreen: React.FC = () => {
         throw new Error('点赞操作失败');
       }
     } catch (error) {
-      console.error('评论点赞操作失败:', error);
-      // 回滚状态
-      const rollbackLikeInTree = (c: Comment): Comment => {
-        if (c.id === id) {
-          return { ...c, is_liked, likes_count };
-        }
-        if (c.replies?.length) {
-          return { ...c, replies: c.replies.map(r => rollbackLikeInTree(r)) };
-        }
-        return c;
-      };
-      setComments(prev => prev.map(c => rollbackLikeInTree(c)));
+      handleError(error, { context: '评论点赞' });
+      setComments(toggleCommentLikeInTree(originalComments, id, oldIsLiked, likes_count));
     }
   };
 

src/screens/message/CreateGroupScreen.tsx

@@ -19,6 +19,7 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
+import { blurActiveElement } from '../../infrastructure/platform';
 import * as ImagePicker from 'expo-image-picker';
 import { spacing, fontSizes, borderRadius, shadows, useAppColors, type AppColors } from '../../theme';
 import { groupService } from '../../services/groupService';
@@ -47,9 +48,8 @@ const CreateGroupScreen: React.FC = () => {
   const [inviteModalVisible, setInviteModalVisible] = useState(false);
 
   useEffect(() => {
-    if (inviteModalVisible && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (inviteModalVisible) {
+      blurActiveElement();
     }
   }, [inviteModalVisible]);
 

src/screens/message/GroupInfoScreen.tsx

@@ -46,6 +46,7 @@ import {
   JoinType,
 } from '../../types/dto';
 import { User } from '../../types';
+import { blurActiveElement } from '../../infrastructure/platform';
 import { firstRouteParam } from '../../navigation/paramUtils';
 import * as hrefs from '../../navigation/hrefs';
 import { messageManager } from '../../stores/messageManager';
@@ -119,9 +120,8 @@ const GroupInfoScreen: React.FC = () => {
   const [inviting, setInviting] = useState(false);
 
   useEffect(() => {
-    if ((editModalVisible || announcementModalVisible || transferModalVisible || joinTypeModalVisible || inviteModalVisible) && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (editModalVisible || announcementModalVisible || transferModalVisible || joinTypeModalVisible || inviteModalVisible) {
+      blurActiveElement();
     }
   }, [editModalVisible, announcementModalVisible, transferModalVisible, joinTypeModalVisible, inviteModalVisible]);
 

src/screens/message/GroupMembersScreen.tsx

@@ -22,6 +22,7 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useLocalSearchParams, useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
+import { blurActiveElement } from '../../infrastructure/platform';
 import { spacing, fontSizes, borderRadius, useAppColors, type AppColors } from '../../theme';
 import { useAuthStore } from '../../stores';
 import { groupService } from '../../services/groupService';
@@ -133,9 +134,8 @@ const GroupMembersScreen: React.FC = () => {
   const [newNickname, setNewNickname] = useState('');
 
   useEffect(() => {
-    if ((actionModalVisible || nicknameModalVisible) && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (actionModalVisible || nicknameModalVisible) {
+      blurActiveElement();
     }
   }, [actionModalVisible, nicknameModalVisible]);
 

src/screens/message/MessageListScreen.tsx

@@ -40,6 +40,7 @@ import {
 } from '../../theme';
 import { ConversationResponse, UserDTO, MessageResponse, extractTextFromSegments } from '../../types/dto';
 import { authService } from '../../services';
+import { blurActiveElement } from '../../infrastructure/platform';
 import { useUserStore, useAuthStore } from '../../stores';
 // 【新架构】使用MessageManager hooks（会话列表数据源自 MessageManager 游标同步）
 import {
@@ -138,9 +139,8 @@ export const MessageListScreen: React.FC = () => {
   const [actionMenuVisible, setActionMenuVisible] = useState(false);
 
   useEffect(() => {
-    if (actionMenuVisible && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (actionMenuVisible) {
+      blurActiveElement();
     }
   }, [actionMenuVisible]);
   const [scannerVisible, setScannerVisible] = useState(false);

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

@@ -15,15 +15,10 @@ import { useResponsive, useBreakpointGTE } from '../../../../hooks/useResponsive
 import { EMOJIS } from './constants';
 import { CustomSticker, getCustomStickers, batchDeleteStickers, addStickerFromUrl } from '../../../../services/stickerService';
 import { useAppColors, spacing } from '../../../../theme';
+import { blurActiveElement } from '../../../../infrastructure/platform';
 
 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 },
@@ -182,7 +177,7 @@ export const EmojiPanel: React.FC<EmojiPanelProps> = ({
 
   // 打开管理界面
   const handleOpenManage = () => {
-    blurActiveElementOnWeb();
+    blurActiveElement();
     setShowManageModal(true);
     setManageMode(false);
     setSelectedStickers(new Set());

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

@@ -20,6 +20,7 @@ import { LongPressMenuProps } from './types';
 import { RECALL_TIME_LIMIT } from './constants';
 import { extractTextFromSegments, ImageSegmentData } from '../../../../types/dto';
 import { isStickerExists, addStickerFromUrl } from '../../../../services/stickerService';
+import { blurActiveElement } from '../../../../infrastructure/platform';
 
 const { width: SCREEN_WIDTH, height: SCREEN_HEIGHT } = Dimensions.get('window');
 
@@ -37,16 +38,11 @@ export const LongPressMenu: React.FC<LongPressMenuProps> = ({
   const styles = useChatScreenStyles();
   const scaleAnimation = useRef(new Animated.Value(0)).current;
   const opacityAnimation = useRef(new Animated.Value(0)).current;
-  const blurActiveElementOnWeb = () => {
-    if (Platform.OS !== 'web') return;
-    const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-    active?.blur?.();
-  };
 
   // 显示动画 - 缩放弹出
   useEffect(() => {
     if (visible) {
-      blurActiveElementOnWeb();
+      blurActiveElement();
       Animated.parallel([
         Animated.spring(scaleAnimation, {
           toValue: 1,
@@ -61,7 +57,7 @@ export const LongPressMenu: React.FC<LongPressMenuProps> = ({
         }),
       ]).start();
     } else {
-      blurActiveElementOnWeb();
+      blurActiveElement();
       Animated.parallel([
         Animated.timing(scaleAnimation, {
           toValue: 0,
@@ -251,12 +247,12 @@ export const LongPressMenu: React.FC<LongPressMenuProps> = ({
       visible={visible}
       transparent
       animationType="none"
-      onShow={blurActiveElementOnWeb}
+      onShow={blurActiveElement}
       onRequestClose={onClose}
     >
       <Pressable
         onPress={() => {
-          blurActiveElementOnWeb();
+          blurActiveElement();
           onClose();
         }}
         style={styles.qqMenuOverlay}

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

@@ -31,7 +31,7 @@ const MAX_WIDTH_RATIO = {
   desktop: 0.55,
 };
 
-export const MessageBubble: React.FC<MessageBubbleProps> = ({
+const MessageBubbleInner: React.FC<MessageBubbleProps> = ({
   message,
   index,
   currentUserId,
@@ -481,11 +481,37 @@ const segmentStyles = StyleSheet.create({
     minWidth: 120,
   },
   pureImageBubble: {
-    // 纯图片消息：去除内边距，让图片紧贴气泡边缘
     paddingHorizontal: 0,
     paddingVertical: 0,
     overflow: 'hidden',
+    backgroundColor: 'transparent',
   },
 });
 
+export const MessageBubble = React.memo(MessageBubbleInner, (prev, next) => {
+  if (prev.message.id !== next.message.id) return false;
+  if (prev.message.status !== next.message.status) return false;
+  if (prev.message.segments !== next.message.segments) return false;
+  if (prev.message.sender_id !== next.message.sender_id) return false;
+  if (prev.message.is_system_notice !== next.message.is_system_notice) return false;
+  if (prev.message.category !== next.message.category) return false;
+  if (prev.message.seq !== next.message.seq) return false;
+  if (prev.message.sender !== next.message.sender) return false;
+  if (prev.message.notice_content !== next.message.notice_content) return false;
+  if (prev.index !== next.index) return false;
+  if (prev.currentUserId !== next.currentUserId) return false;
+  if (prev.otherUserLastReadSeq !== next.otherUserLastReadSeq) return false;
+  if (prev.selectedMessageId !== next.selectedMessageId) return false;
+  if (prev.isGroupChat !== next.isGroupChat) return false;
+  if (prev.groupMembers !== next.groupMembers) return false;
+  if (prev.currentUser !== next.currentUser) return false;
+  if (prev.otherUser !== next.otherUser) return false;
+  if (prev.messageMap !== next.messageMap) return false;
+  if (prev.onLongPress !== next.onLongPress) return false;
+  if (prev.onImagePress !== next.onImagePress) return false;
+  if (prev.onReplyPress !== next.onReplyPress) return false;
+  if (prev.shouldShowTime !== next.shouldShowTime) return false;
+  return true;
+});
+
 export default MessageBubble;

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

@@ -165,7 +165,7 @@ const renderTextSegment = (data: TextSegmentData, isMe: boolean): React.ReactNod
  * 渲染图片 Segment
  */
 // 图片Segment组件 - 使用Hook获取实际尺寸
-const ImageSegment: React.FC<{
+const ImageSegmentInner: React.FC<{
   data: ImageSegmentData;
   isMe: boolean;
   onImagePress?: (url: string) => void;
@@ -284,7 +284,6 @@ const ImageSegment: React.FC<{
           style={{
             width: IMAGE_FALLBACK_SIZE.width,
             height: IMAGE_FALLBACK_SIZE.height,
-            borderRadius: 8,
             backgroundColor: 'rgba(0,0,0,0.1)',
             justifyContent: 'center',
             alignItems: 'center',
@@ -312,7 +311,6 @@ const ImageSegment: React.FC<{
           style={{
             width: IMAGE_FALLBACK_SIZE.width,
             height: IMAGE_FALLBACK_SIZE.height,
-            borderRadius: 8,
             backgroundColor: 'rgba(0,0,0,0.1)',
           }}
         />
@@ -334,7 +332,6 @@ const ImageSegment: React.FC<{
         style={{
           width: dimensions.width,
           height: dimensions.height,
-          borderRadius: 8,
         }}
         recyclingKey={stableImageKey}
         contentFit="cover"
@@ -345,7 +342,6 @@ const ImageSegment: React.FC<{
           setLoadError(false);
         }}
         onError={() => {
-          // 缩略图失败时自动回退原图，降低跳转定位后的白块/丢图概率
           if (data.thumbnail_url && data.url && imageUrl === data.thumbnail_url) {
             setCurrentImageUri(data.url);
             return;
@@ -357,6 +353,17 @@ const ImageSegment: React.FC<{
   );
 };
 
+const ImageSegment = React.memo(ImageSegmentInner, (prev, next) => {
+  if (prev.data.url !== next.data.url) return false;
+  if (prev.data.thumbnail_url !== next.data.thumbnail_url) return false;
+  if (prev.data.width !== next.data.width) return false;
+  if (prev.data.height !== next.data.height) return false;
+  if (prev.isMe !== next.isMe) return false;
+  if (prev.onImagePress !== next.onImagePress) return false;
+  if (prev.onImageLongPress !== next.onImageLongPress) return false;
+  return true;
+});
+
 const renderImageSegment = (
   data: ImageSegmentData, 
   props: Omit<SegmentRendererProps, 'segment'>
@@ -705,7 +712,7 @@ export const ReplyPreviewSegment: React.FC<ReplyPreviewSegmentProps> = ({
 /**
  * 渲染完整的消息链（多个 Segment 组合）
  */
-export const MessageSegmentsRenderer: React.FC<{
+const MessageSegmentsRendererInner: React.FC<{
   segments: MessageSegment[];
   isMe: boolean;
   currentUserId?: string;
@@ -734,11 +741,11 @@ export const MessageSegmentsRenderer: React.FC<{
   const fontSize = useChatSettingsStore((s) => s.fontSize);
   const segStyles = useMemo(() => createSegmentStyles(themeColors, fontSize), [themeColors, fontSize]);
 
-  const replySegment = segments.find(s => s.type === 'reply');
-  const otherSegments = segments.filter(s => s.type !== 'reply');
-  const chunks = partitionMessageSegments(otherSegments);
+  const replySegment = useMemo(() => segments.find(s => s.type === 'reply'), [segments]);
+  const otherSegments = useMemo(() => segments.filter(s => s.type !== 'reply'), [segments]);
+  const chunks = useMemo(() => partitionMessageSegments(otherSegments), [otherSegments]);
 
-  const renderProps = {
+  const renderProps = useMemo(() => ({
     isMe,
     currentUserId,
     memberMap,
@@ -747,7 +754,7 @@ export const MessageSegmentsRenderer: React.FC<{
     onImagePress,
     onImageLongPress,
     onLinkPress,
-  };
+  }), [isMe, currentUserId, memberMap, onAtPress, onReplyPress, onImagePress, onImageLongPress, onLinkPress]);
 
   return (
     <SegmentStylesContext.Provider value={segStyles}>
@@ -837,13 +844,16 @@ function createSegmentStyles(colors: AppColors, fontSize: number = 16) {
   },
   imagesChunk: {
     width: '100%',
+    overflow: 'hidden',
   },
   imageStackItem: {
     width: '100%',
-    marginBottom: 6,
+    marginBottom: 4,
+    overflow: 'hidden',
   },
   imageStackItemLast: {
     width: '100%',
+    overflow: 'hidden',
   },
   blockChunk: {
     width: '100%',
@@ -864,14 +874,13 @@ function createSegmentStyles(colors: AppColors, fontSize: number = 16) {
     color: colors.chat.textPrimary,
   },
 
-  // @提及 - 微信/QQ 风格：更精致的高亮，支持动态字号
+  // @提及 - 与普通文本字号一致，仅颜色区分
   atText: {
     fontSize,
-    lineHeight: Math.round(fontSize * 1.4),
-    fontWeight: '500',
+    lineHeight: Math.round(fontSize * 1.43),
   },
   atTextMe: {
-    color: '#1A5F9E',  // 深蓝色，在绿色背景上更清晰
+    color: '#1A5F9E',
   },
   atTextOther: {
     color: colors.chat.link,
@@ -879,25 +888,15 @@ function createSegmentStyles(colors: AppColors, fontSize: number = 16) {
   atHighlight: {
     backgroundColor: 'rgba(74, 136, 199, 0.15)',
     borderRadius: 4,
-    paddingHorizontal: 3,
   },
 
   // 图片 - QQ风格：保持原始宽高比
   imageContainer: {
-    borderRadius: 12,
     overflow: 'hidden',
-    marginTop: 4,
-    shadowColor: colors.chat.shadow,
-    shadowOffset: { width: 0, height: 2 },
-    shadowOpacity: 0.15,
-    shadowRadius: 4,
-    elevation: 4,
   },
   imageMe: {
-    borderBottomRightRadius: 4,
   },
   imageOther: {
-    borderBottomLeftRadius: 4,
   },
   // 移除固定的 image 样式，改为在组件中动态计算
 
@@ -1143,4 +1142,19 @@ function useSegmentStyles(): SegmentStyles {
   return ctx;
 }
 
+export const MessageSegmentsRenderer = React.memo(MessageSegmentsRendererInner, (prev, next) => {
+  if (prev.segments !== next.segments) return false;
+  if (prev.isMe !== next.isMe) return false;
+  if (prev.currentUserId !== next.currentUserId) return false;
+  if (prev.memberMap !== next.memberMap) return false;
+  if (prev.replyMessage !== next.replyMessage) return false;
+  if (prev.onAtPress !== next.onAtPress) return false;
+  if (prev.onReplyPress !== next.onReplyPress) return false;
+  if (prev.onImagePress !== next.onImagePress) return false;
+  if (prev.onImageLongPress !== next.onImageLongPress) return false;
+  if (prev.onLinkPress !== next.onLinkPress) return false;
+  if (prev.getSenderInfo !== next.getSenderInfo) return false;
+  return true;
+});
+
 export default MessageSegmentsRenderer;

src/screens/message/components/ChatScreen/useChatScreen.ts

@@ -174,9 +174,9 @@ export const useChatScreen = () => {
       status: (m.status || 'normal') as MessageStatus,
       category: m.category,
       created_at: m.created_at,
-      sender: (m as any).sender,
-      is_system_notice: (m as any).is_system_notice,
-      notice_content: (m as any).notice_content,
+      sender: m.sender,
+      is_system_notice: m.is_system_notice,
+      notice_content: m.notice_content,
     }));
   }, [messageManagerMessages]);
 
@@ -258,7 +258,7 @@ export const useChatScreen = () => {
         setOtherUser(prev => ({ ...(prev || {}), ...other }));
       }
       // 获取对方最后阅读位置
-      setOtherUserLastReadSeq((conversation as any).other_last_read_seq || 0);
+      setOtherUserLastReadSeq(conversation.other_last_read_seq || 0);
     }
   }, [conversation, isGroupChat, currentUserId]);
 
@@ -273,8 +273,8 @@ export const useChatScreen = () => {
         const detail = await userManager.getUserById(String(otherUserId), true);
         if (!detail || cancelled) return;
         setOtherUser(prev => ({ ...(prev || {}), ...detail }));
-        if (typeof (detail as any).is_following_me === 'boolean') {
-          setIsFollowedByOther((detail as any).is_following_me);
+        if (typeof detail.is_following_me === 'boolean') {
+          setIsFollowedByOther(detail.is_following_me);
         } else {
           setIsFollowedByOther(null);
         }
@@ -360,7 +360,7 @@ export const useChatScreen = () => {
   }, [loading, loadingMore, messages.length, scrollToLatest]);
 
   // 新消息跟随策略（Telegram/QQ 风格）：
-  // 仅当“最新端消息 seq 增长”且用户在底部附近时才跟随；
+  // 仅当"最新端消息 seq 增长"且用户在底部附近时才跟随；
   // 历史加载只会增加旧消息，不会提升 latest seq，因此不会触发回底。
   useEffect(() => {
     const currentCount = messages.length;
@@ -371,14 +371,14 @@ export const useChatScreen = () => {
 
     if (loading || loadingMore) return;
     if (latestSeq <= prevLatestSeq) return;
-    if (suppressAutoFollowRef.current) return;
+    if (suppressAutoFollowRef.current || isBrowsingHistoryRef.current || isHistoryLoadingLocked()) return;
     if (!isNearBottom()) return;
 
     const timer = setTimeout(() => {
       scrollToLatest(false, false, 'new-message-follow');
     }, 0);
     return () => clearTimeout(timer);
-  }, [messages, loading, loadingMore, isNearBottom, scrollToLatest]);
+  }, [messages, loading, loadingMore, isNearBottom, scrollToLatest, isHistoryLoadingLocked]);
 
   // 获取当前用户信息
   useEffect(() => {
@@ -559,10 +559,10 @@ export const useChatScreen = () => {
     if (!conversationId) return;
     if (!conversation) return;
 
-    const unreadCount = Number((conversation as any).unread_count || 0);
+    const unreadCount = Number(conversation.unread_count || 0);
     if (unreadCount <= 0) return;
 
-    const latestFromConversation = Number((conversation as any).last_seq || 0);
+    const latestFromConversation = Number(conversation.last_seq || 0);
     const latestFromMessages = messages.length > 0 ? Math.max(...messages.map(m => m.seq || 0)) : 0;
     const targetSeq = Math.max(latestFromConversation, latestFromMessages);
     if (targetSeq <= 0) return;
@@ -1305,8 +1305,8 @@ export const useChatScreen = () => {
 
   // 关闭所有面板
   const handleDismiss = useCallback(() => {
+    Keyboard.dismiss();
     if (activePanel !== 'none') {
-      Keyboard.dismiss();
       setActivePanel('none');
     }
   }, [activePanel]);

src/screens/message/components/MutualFollowSelectorModal.tsx

@@ -16,6 +16,7 @@ import { spacing, fontSizes, borderRadius, useAppColors, type AppColors } from '
 import { authService } from '../../../services/authService';
 import { useAuthStore } from '../../../stores';
 import { Avatar, EmptyState, Loading, Text } from '../../../components/common';
+import { blurActiveElement } from '../../../infrastructure/platform';
 import { User } from '../../../types';
 
 type MutualFollowSelectorModalProps = {
@@ -57,10 +58,7 @@ const MutualFollowSelectorModal: React.FC<MutualFollowSelectorModalProps> = ({
 
   useEffect(() => {
     if (!visible) return;
-    if (Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
-    }
+    blurActiveElement();
     if (!currentUserId) return;
 
     const nextSelectedIds = new Set(stableInitialSelectedIds);

src/screens/profile/AboutScreen.tsx

@@ -482,7 +482,6 @@ export const AboutScreen: React.FC = () => {
   const appInfoItems = [
     { key: 'name', icon: 'information-outline', title: '应用名称', value: APP_NAME },
     { key: 'version', icon: 'tag-outline', title: '版本号', value: `v${APP_VERSION} (${BUILD_NUMBER})` },
-    { key: 'developer', icon: 'office-building-outline', title: '开发者', value: '青春之旅电子信息科技' },
   ];
 
   const renderSettingItem = (item: { key: string; icon: string; title: string; value?: string; action?: () => void }, index: number, total: number, showArrow: boolean = false) => (

src/screens/schedule/ScheduleScreen.tsx

@@ -22,6 +22,7 @@ import { PanGestureHandler, State } from 'react-native-gesture-handler';
 import type { PanGestureHandlerStateChangeEvent } from 'react-native-gesture-handler';
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
+import { blurActiveElement } from '../../infrastructure/platform';
 import { useFocusEffect } from '@react-navigation/native';
 import { useRouter } from 'expo-router';
 import {
@@ -214,9 +215,8 @@ export const ScheduleScreen: React.FC = () => {
   const [isSyncing, setIsSyncing] = useState(false);
 
   useEffect(() => {
-    if ((isAddModalVisible || isSettingsModalVisible || isSyncModalVisible) && Platform.OS === 'web') {
-      const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
-      active?.blur?.();
+    if (isAddModalVisible || isSettingsModalVisible || isSyncModalVisible) {
+      blurActiveElement();
     }
   }, [isAddModalVisible, isSettingsModalVisible, isSyncModalVisible]);
 

src/services/errorHandler.ts

@@ -0,0 +1,196 @@
+/**
+ * 统一错误处理服务
+ * 
+ * 提供标准化的错误处理流程：
+ * 1. 错误分类（网络错误、认证错误、业务错误等）
+ * 2. 日志记录
+ * 3. 用户提示
+ * 4. 错误上报
+ * 
+ * 替代散落在代码中的 console.error + 手动 Alert 模式
+ */
+
+import { showPrompt } from './promptService';
+
+export enum AppErrorCode {
+  NETWORK_ERROR = 'NETWORK_ERROR',
+  AUTH_ERROR = 'AUTH_ERROR',
+  FORBIDDEN = 'FORBIDDEN',
+  NOT_FOUND = 'NOT_FOUND',
+  VALIDATION_ERROR = 'VALIDATION_ERROR',
+  SERVER_ERROR = 'SERVER_ERROR',
+  TIMEOUT = 'TIMEOUT',
+  UNKNOWN = 'UNKNOWN',
+}
+
+export interface AppError {
+  code: AppErrorCode;
+  message: string;
+  originalError?: unknown;
+  context?: string;
+  silent?: boolean;
+}
+
+const ERROR_MESSAGES: Record<AppErrorCode, string> = {
+  [AppErrorCode.NETWORK_ERROR]: '网络连接失败，请检查网络设置',
+  [AppErrorCode.AUTH_ERROR]: '登录已过期，请重新登录',
+  [AppErrorCode.FORBIDDEN]: '没有权限执行此操作',
+  [AppErrorCode.NOT_FOUND]: '请求的资源不存在',
+  [AppErrorCode.VALIDATION_ERROR]: '输入数据有误，请检查后重试',
+  [AppErrorCode.SERVER_ERROR]: '服务器错误，请稍后重试',
+  [AppErrorCode.TIMEOUT]: '请求超时，请稍后重试',
+  [AppErrorCode.UNKNOWN]: '操作失败，请稍后重试',
+};
+
+function classifyError(error: unknown): AppErrorCode {
+  if (!error) return AppErrorCode.UNKNOWN;
+
+  if (error instanceof Error) {
+    const message = error.message.toLowerCase();
+    
+    if (message.includes('network') || message.includes('fetch') || message.includes('econnrefused')) {
+      return AppErrorCode.NETWORK_ERROR;
+    }
+    if (message.includes('timeout') || message.includes('timed out')) {
+      return AppErrorCode.TIMEOUT;
+    }
+    if (message.includes('unauthorized') || message.includes('401') || message.includes('token')) {
+      return AppErrorCode.AUTH_ERROR;
+    }
+    if (message.includes('forbidden') || message.includes('403')) {
+      return AppErrorCode.FORBIDDEN;
+    }
+    if (message.includes('not found') || message.includes('404')) {
+      return AppErrorCode.NOT_FOUND;
+    }
+    if (message.includes('validation') || message.includes('400') || message.includes('422')) {
+      return AppErrorCode.VALIDATION_ERROR;
+    }
+    if (message.includes('500') || message.includes('502') || message.includes('503')) {
+      return AppErrorCode.SERVER_ERROR;
+    }
+  }
+
+  if (typeof error === 'object' && error !== null) {
+    const err = error as Record<string, unknown>;
+    const status = err.status || err.statusCode || err.code;
+    
+    if (status === 401) return AppErrorCode.AUTH_ERROR;
+    if (status === 403) return AppErrorCode.FORBIDDEN;
+    if (status === 404) return AppErrorCode.NOT_FOUND;
+    if (status === 400 || status === 422) return AppErrorCode.VALIDATION_ERROR;
+    if (typeof status === 'number' && status >= 500) return AppErrorCode.SERVER_ERROR;
+  }
+
+  return AppErrorCode.UNKNOWN;
+}
+
+export function createAppError(
+  error: unknown,
+  context?: string,
+  options?: { silent?: boolean; userMessage?: string }
+): AppError {
+  const code = classifyError(error);
+  return {
+    code,
+    message: options?.userMessage || ERROR_MESSAGES[code],
+    originalError: error,
+    context,
+    silent: options?.silent,
+  };
+}
+
+export interface ErrorHandlerOptions {
+  context?: string;
+  userMessage?: string;
+  silent?: boolean;
+  showErrorPrompt?: boolean;
+  logToConsole?: boolean;
+}
+
+/**
+ * 统一错误处理函数
+ * 
+ * 替代散落的 console.error + Alert 模式
+ * 
+ * @example
+ * // 之前
+ * } catch (error) {
+ *   console.error('加载帖子详情失败:', error);
+ * }
+ * 
+ * // 之后
+ * } catch (error) {
+ *   handleError(error, { context: '加载帖子详情' });
+ * }
+ */
+export function handleError(error: unknown, options: ErrorHandlerOptions = {}): AppError {
+  const {
+    context,
+    userMessage,
+    silent = false,
+    showErrorPrompt = false,
+    logToConsole = true,
+  } = options;
+
+  const appError = createAppError(error, context, { silent, userMessage });
+
+  if (logToConsole) {
+    const prefix = context ? `[${context}]` : '';
+    console.error(`${prefix} ${appError.message}`, error);
+  }
+
+  if (showErrorPrompt && !silent) {
+    showPrompt({
+      type: 'error',
+      title: context || '错误',
+      message: appError.message,
+      duration: 3000,
+    });
+  }
+
+  return appError;
+}
+
+/**
+ * 创建带上下文的错误处理器
+ * 
+ * @example
+ * const postErrorHandler = createErrorHandler('帖子');
+ * 
+ * } catch (error) {
+ *   postErrorHandler(error, { showErrorPrompt: true });
+ * }
+ */
+export function createErrorHandler(defaultContext: string) {
+  return (error: unknown, options: Omit<ErrorHandlerOptions, 'context'> = {}) => {
+    return handleError(error, { ...options, context: defaultContext });
+  };
+}
+
+/**
+ * 安全执行异步操作
+ * 
+ * @example
+ * const result = await safeAsync(
+ *   () => postService.getPost(id),
+ *   { context: '加载帖子' }
+ * );
+ * if (result.error) {
+ *   // 处理错误
+ * } else {
+ *   // 使用 result.data
+ * }
+ */
+export async function safeAsync<T>(
+  fn: () => Promise<T>,
+  options: ErrorHandlerOptions = {}
+): Promise<{ data: T | null; error: AppError | null }> {
+  try {
+    const data = await fn();
+    return { data, error: null };
+  } catch (error) {
+    const appError = handleError(error, options);
+    return { data: null, error: appError };
+  }
+}

src/services/index.ts

@@ -111,6 +111,11 @@ export {
 export { showPrompt } from './promptService';
 export { showConfirm } from './dialogService';
 
+// 统一错误处理服务
+export { handleError, createErrorHandler, safeAsync, createAppError } from './errorHandler';
+export type { AppError, ErrorHandlerOptions } from './errorHandler';
+export { AppErrorCode } from './errorHandler';
+
 // APK 更新检查服务
 export { apkUpdateService, checkForAPKUpdate, manualCheckForUpdate } from './apkUpdateService';
 export type { APKVersionInfo, VersionCheckResult } from './apkUpdateService';

src/stores/userStore.ts

@@ -254,18 +254,13 @@ export const useUserStore = create<UserState>((set, get) => {
     followUser: async (userId: string) => {
       const originalUsers = get().users;
       const originalUserCache = get().userCache;
-      
-      // 乐观更新 users
+
       set(state => ({
         users: state.users.map(u =>
           u.id === userId
             ? { ...u, isFollowing: true, followersCount: u.followers_count + 1 }
             : u
         ),
-      }));
-      
-      // 乐观更新 userCache
-      set(state => ({
         userCache: Object.fromEntries(
           Object.entries(state.userCache).map(([id, user]) => [
             id,
@@ -275,35 +270,25 @@ export const useUserStore = create<UserState>((set, get) => {
           ])
         )
       }));
-      
+
       try {
         await authService.followUser(userId);
       } catch (error) {
         console.error('关注用户失败:', error);
-        // 回滚
-        set({ 
-          users: originalUsers,
-          userCache: originalUserCache 
-        });
+        set({ users: originalUsers, userCache: originalUserCache });
       }
     },
     
-    // 取消关注 - authService 不管理状态，所以由 store 管理
     unfollowUser: async (userId: string) => {
       const originalUsers = get().users;
       const originalUserCache = get().userCache;
-      
-      // 乐观更新 users
+
       set(state => ({
         users: state.users.map(u =>
           u.id === userId
             ? { ...u, isFollowing: false, followersCount: Math.max(0, u.followers_count - 1) }
             : u
         ),
-      }));
-      
-      // 乐观更新 userCache
-      set(state => ({
         userCache: Object.fromEntries(
           Object.entries(state.userCache).map(([id, user]) => [
             id,
@@ -313,16 +298,12 @@ export const useUserStore = create<UserState>((set, get) => {
           ])
         )
       }));
-      
+
       try {
         await authService.unfollowUser(userId);
       } catch (error) {
         console.error('取消关注用户失败:', error);
-        // 回滚
-        set({ 
-          users: originalUsers,
-          userCache: originalUserCache 
-        });
+        set({ users: originalUsers, userCache: originalUserCache });
       }
     },
     

src/types/dto.ts

@@ -231,16 +231,18 @@ export type MessageSegment =
 
 // 消息响应
 export interface MessageResponse {
-  id: string;  // 雪花算法ID (使用string避免JavaScript精度丢失)
+  id: string;
   conversation_id: string;
-  sender_id: string;  // UUID字符串
-  seq: number;  // 消息序号
-  segments: MessageSegment[];  // 消息链
-  reply_to_id?: string;  // 被回复消息的ID（用于关联查找）
+  sender_id: string;
+  seq: number;
+  segments: MessageSegment[];
+  reply_to_id?: string;
   status: MessageStatus;
-  category?: string;  // 消息类别：chat, notification, announcement
+  category?: string;
   created_at: string;
   sender?: UserDTO;
+  is_system_notice?: boolean;
+  notice_content?: string;
 }
 
 // 会话响应