fix: 欢迎页发送消息后侧边栏即时刷新会话列表

在 handleSend 中 createConversation 成功后立即调用 invalidateQueries，
同时传入 displayModelId 保持与侧边栏新建会话行为一致。

src/web/consoles/workbench/components/chat/ChatPanel.tsx

@@ -140,8 +140,9 @@ export function ChatPanel({ conversationId, onConversationCreated, projectId }:
 
     if (!conversationId) {
       try {
-        const conv = await createConversation(projectId);
+        const conv = await createConversation(projectId, displayModelId ?? undefined);
         skipHistoryLoadRef.current = conv.id;
+        void queryClient.invalidateQueries({ queryKey: ["conversations", projectId] });
         void sendMessage({ text }, { body: { conversationId: conv.id } });
         onConversationCreated(conv.id);
       } catch (err: unknown) {
@@ -153,7 +154,7 @@ export function ChatPanel({ conversationId, onConversationCreated, projectId }:
     }
 
     void sendMessage({ text }, { body: { conversationId } });
-  }, [input, sendMessage, conversationId, projectId, onConversationCreated, message]);
+  }, [input, sendMessage, conversationId, projectId, onConversationCreated, message, queryClient, displayModelId]);
 
   const extractText = useCallback((msg: UIMessage) => {
     return msg.parts