refactor(ProcessPostUseCase, useCursorPagination, useDifferentialPosts): enhance post merging and loading states

- Introduced new methods for merging posts and comments efficiently, improving performance during data updates.
- Updated loading state management in hooks to include initial loading and loading more states for better user feedback.
- Refactored HomeScreen and PostDetailScreen to utilize the new loading states and merging logic, enhancing user experience during data fetching.
- Improved pagination handling in useCursorPagination and useDifferentialPosts to ensure consistent data management across components.

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

@@ -120,6 +120,7 @@ export const useChatScreen = () => {
   const prevMessageCountRef = useRef(0);
   const prevLatestSeqRef = useRef(0);
   const prevMarkedReadSeqRef = useRef(0);
+  const enterMarkedKeyRef = useRef<string>('');
   const isProgrammaticScrollRef = useRef(false);
   const suppressAutoFollowRef = useRef(false);
   const isBrowsingHistoryRef = useRef(false);
@@ -277,6 +278,7 @@ export const useChatScreen = () => {
     prevMessageCountRef.current = 0;
     prevLatestSeqRef.current = 0;
     prevMarkedReadSeqRef.current = 0;
+    enterMarkedKeyRef.current = '';
     suppressAutoFollowRef.current = false;
     isBrowsingHistoryRef.current = false;
   }, [conversationId]);
@@ -479,6 +481,29 @@ export const useChatScreen = () => {
     isBrowsingHistoryRef.current = browsing;
   }, []);
 
+  // 进入聊天详情后立即清未读（不依赖滚动位置）
+  useEffect(() => {
+    if (!conversationId) return;
+    if (!conversation) return;
+
+    const unreadCount = Number((conversation as any).unread_count || 0);
+    if (unreadCount <= 0) return;
+
+    const latestFromConversation = Number((conversation as any).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;
+
+    const markKey = `${conversationId}:${targetSeq}`;
+    if (enterMarkedKeyRef.current === markKey) return;
+    enterMarkedKeyRef.current = markKey;
+
+    prevMarkedReadSeqRef.current = Math.max(prevMarkedReadSeqRef.current, targetSeq);
+    markAsRead(targetSeq).catch(error => {
+      console.error('[ChatScreen] 进入会话清未读失败:', error);
+    });
+  }, [conversationId, conversation, messages, markAsRead]);
+
   // 自动标记已读（QQ/Telegram 风格）：
   // 仅当出现更大的 latest seq，且用户在最新端附近时才上报。
   // 历史加载/浏览历史不会触发 read。
@@ -521,20 +546,10 @@ export const useChatScreen = () => {
     const keyboardWillShow = (e: KeyboardEvent) => {
       setKeyboardHeight(e.endCoordinates.height);
       setActivePanel(prev => prev === 'mention' ? 'mention' : 'none');
-      if (isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'keyboard-show');
-        }, 150);
-      }
     };
 
     const keyboardWillHide = () => {
       setKeyboardHeight(0);
-      if (isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'keyboard-hide');
-        }, 100);
-      }
     };
 
     const showSubscription = Keyboard.addListener(
@@ -550,7 +565,7 @@ export const useChatScreen = () => {
       showSubscription.remove();
       hideSubscription.remove();
     };
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 格式化时间
   const formatTime = useCallback((dateString: string): string => {
@@ -996,28 +1011,18 @@ export const useChatScreen = () => {
     Keyboard.dismiss();
     setActivePanel(prev => {
       const newPanel = prev === 'emoji' ? 'none' : 'emoji';
-      if (newPanel !== 'none' && isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'open-emoji-panel');
-        }, 200);
-      }
       return newPanel;
     });
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 切换更多功能面板
   const toggleMorePanel = useCallback(() => {
     Keyboard.dismiss();
     setActivePanel(prev => {
       const newPanel = prev === 'more' ? 'none' : 'more';
-      if (newPanel !== 'none' && isNearBottom()) {
-        setTimeout(() => {
-          scrollToLatest(false, false, 'open-more-panel');
-        }, 200);
-      }
       return newPanel;
     });
-  }, [scrollToLatest, isNearBottom]);
+  }, []);
 
   // 关闭面板
   const closePanel = useCallback(() => {