fix(message): improve message synchronization and reliability

Refactor the messaging subsystem to enhance data consistency, prevent race conditions during WebSocket reconnection, and ensure accurate unread counts.

- **WebSocket Reliability**: Implement `client_msg_id` for precise message ACK matching, preventing incorrect pending message resolution in high-frequency scenarios.
- **Sync Logic**: Update `WSMessageHandler` and `MessageManager` to use a bootstrapping state, ensuring buffered SSE events are flushed only after the initial synchronization is complete.
- **State Consistency**:
    - Introduce atomic unread count increments to prevent lost updates.
    - Implement conditional rollback for optimistic read receipts, ensuring that failed API calls do not overwrite newer, valid read states.
- **Resource Management**: Add reference counting to `useMessages` hook to prevent premature clearing of loading states during rapid conversation switching or React StrictMode double-invocations.
- **Data Integrity**: Update `UserCacheService` to re-read the latest message list before applying sender info enrichment, ensuring new messages arriving during the async process are correctly processed.

src/stores/message/hooks.ts

@@ -100,9 +100,14 @@ interface UseMessagesReturn {
  *
  * 核心修复：
  * 1. useFocusEffect：屏幕重新获得焦点时强制同步消息，解决"需要退出重进才能看到新消息"的问题
- * 2. 清理 isLoadingMessages：组件卸载时清除残留的 loading 锁，防止下次进入被阻断
+ * 2. 引用计数清理 isLoadingMessages：仅在最后一个订阅者卸载时清除 loading 锁，
+ *    避免 StrictMode 双调用或快速切换会话时，第一次 fetch 还没完成就被清锁
  * 3. 重入时 forceSync：相同 conversationId 重复进入时强制拉取最新消息
  */
+
+// 记录每个 conversationId 上的活跃订阅数，仅在归零时清锁
+const loadingLockRefCount: Map<string, number> = new Map();
+
 export function useMessages(conversationId: string | null): UseMessagesReturn {
   const normalizedConversationId = conversationId ? String(conversationId) : null;
 
@@ -128,6 +133,10 @@ export function useMessages(conversationId: string | null): UseMessagesReturn {
       return;
     }
 
+    // 引用计数 +1
+    const prevCount = loadingLockRefCount.get(normalizedConversationId) ?? 0;
+    loadingLockRefCount.set(normalizedConversationId, prevCount + 1);
+
     lastActivatedAtRef.current = Date.now();
 
     const isReentry = lastActivatedIdRef.current === normalizedConversationId;
@@ -141,11 +150,17 @@ export function useMessages(conversationId: string | null): UseMessagesReturn {
     lastActivatedIdRef.current = normalizedConversationId;
 
     return () => {
-      // 清理活动会话 + 清除残留的 loading 锁
-      if (messageManager.getActiveConversation() === normalizedConversationId) {
-        messageManager.setActiveConversation(null);
+      // 引用计数 -1，仅在最后一个订阅者卸载时清活动会话 + 清 loading 锁
+      const nextCount = (loadingLockRefCount.get(normalizedConversationId) ?? 1) - 1;
+      if (nextCount <= 0) {
+        loadingLockRefCount.delete(normalizedConversationId);
+        if (messageManager.getActiveConversation() === normalizedConversationId) {
+          messageManager.setActiveConversation(null);
+        }
+        useMessageStore.getState().setLoadingMessages(normalizedConversationId, false);
+      } else {
+        loadingLockRefCount.set(normalizedConversationId, nextCount);
       }
-      useMessageStore.getState().setLoadingMessages(normalizedConversationId, false);
     };
   }, [normalizedConversationId]);