fix(weChat): 修复消息加载顺序和加载状态显示问题

调整消息数组拼接顺序，确保新消息正确追加
添加加载状态图标并优化加载更多消息的逻辑
设置消息加载状态延迟更新以避免闪烁

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

@@ -72,8 +72,8 @@ export const useWeChatStore = create<WeChatState>()(
             } else {
               set({
                 currentMessages: [
-                  ...state.currentMessages,
                   ...(messages || []),
+                  ...state.currentMessages,
                 ],
               });
             }
@@ -85,8 +85,8 @@ export const useWeChatStore = create<WeChatState>()(
             } else {
               set({
                 currentMessages: [
-                  ...state.currentMessages,
                   ...(messages || []),
+                  ...state.currentMessages,
                 ],
               });
             }
@@ -94,7 +94,9 @@ export const useWeChatStore = create<WeChatState>()(
         } catch (error) {
           console.error("获取聊天消息失败:", error);
         } finally {
-          set({ messagesLoading: false });
+          setTimeout(() => {
+            set({ messagesLoading: false });
+          }, 1500);
         }
       },