fix closed conversation messages

web/app/ai-chat/page.js

@@ -440,6 +440,8 @@ function AiChatPage() {
     setMessages([]);
     setError(null);
     setBotTyping(false);
+    await Promise.all([fetchConversation(convId), fetchMessages(convId)]);
+    connectStomp(convId);
     router.replace(`/ai-chat?id=${convId}`, { scroll: false });
   }
 

web/app/chat/page.js

@@ -422,6 +422,10 @@ function ChatPage() {
     if (stompRef.current) { stompRef.current.deactivate(); stompRef.current = null; }
     setMessages([]);
     setError(null);
+    setSwitchingConv(true);
+    await Promise.all([fetchConversation(convId), fetchMessages(convId)]);
+    setSwitchingConv(false);
+    connectStomp(convId);
     router.replace(`/chat?id=${convId}`, { scroll: false });
   }