feat: 修复打字机效果闪烁的问题

pages/chat/ChatMainList.vue

@@ -344,6 +344,7 @@ const initWebSocket = () => {
 
     // 错误回调
     onError: (error) => {
+        isSessionActive.value = false;
       console.error("WebSocket错误:", error);
     },
 
@@ -367,6 +368,10 @@ const initWebSocket = () => {
 
 // 处理WebSocket消息
 const handleWebSocketMessage = (data) => {
+    if(loadingTimer) {
+        clearInterval(loadingTimer);
+        loadingTimer = null;
+    }
   const aiMsgIndex = chatMsgList.value.length - 1;
   if (!chatMsgList.value[aiMsgIndex] || aiMsgIndex < 0) {
     return;