fix(weChat): 移除消息加载状态的延迟设置

移除setTimeout延迟设置messagesLoading为false的逻辑，改为在try和finally块中直接设置，避免不必要的延迟

Cunkebao/src/store/module/weChat/weChat.ts

@@ -91,12 +91,11 @@ export const useWeChatStore = create<WeChatState>()(
               });
             }
           }
+          set({ messagesLoading: false });
         } catch (error) {
           console.error("获取聊天消息失败:", error);
         } finally {
-          setTimeout(() => {
-            set({ messagesLoading: false });
-          }, 1500);
+          set({ messagesLoading: false });
         }
       },