Migrate frontend realtime messaging to SSE.

Switch service integrations and screen/store consumers from websocket events to SSE, and ignore generated dist-web artifacts.

Made-with: Cursor

src/components/business/PostCard.tsx

@@ -13,8 +13,6 @@ import {
   useWindowDimensions,
 } from 'react-native';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { formatDistanceToNow } from 'date-fns';
-import { zhCN } from 'date-fns/locale';
 import { colors, spacing, fontSizes, borderRadius } from '../../theme';
 import { Post } from '../../types';
 import Text from '../common/Text';
@@ -128,16 +126,20 @@ const PostCard: React.FC<PostCardProps> = ({
     return 0; // 移动端无额外内边距
   }, [isWideScreen, isDesktop, isTablet]);
 
-  const formatTime = (dateString: string | undefined | null): string => {
+  const formatDateTime = (dateString?: string | null): string => {
     if (!dateString) return '';
-    try {
-      return formatDistanceToNow(new Date(dateString), {
-        addSuffix: true,
-        locale: zhCN,
-      });
-    } catch {
-      return '';
-    }
+    const date = new Date(dateString);
+    if (Number.isNaN(date.getTime())) return '';
+    const pad = (num: number) => String(num).padStart(2, '0');
+    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}`;
+  };
+
+  const isPostEdited = (createdAt?: string, updatedAt?: string): boolean => {
+    if (!createdAt || !updatedAt) return false;
+    const created = new Date(createdAt).getTime();
+    const updated = new Date(updatedAt).getTime();
+    if (Number.isNaN(created) || Number.isNaN(updated)) return false;
+    return updated - created > 1000;
   };
 
   const getTruncatedContent = (content: string | undefined | null, maxLength: number = 100): string => {
@@ -497,8 +499,13 @@ const PostCard: React.FC<PostCardProps> = ({
           </View>
           <View style={styles.postMeta}>
             <Text variant="caption" color={colors.text.hint} style={styles.timeText}>
-              {formatTime(post.created_at || '')}
+              发布 {formatDateTime(post.created_at)}
             </Text>
+            {isPostEdited(post.created_at, post.updated_at) && (
+              <Text variant="caption" color={colors.text.hint} style={styles.timeText}>
+                {' · 修改 '}{formatDateTime(post.updated_at)}
+              </Text>
+            )}
           </View>
         </View>
         {post.is_pinned && (