fix: show empty work preview without invoking the Agent

tests/unit/agent-browser-panel.test.tsx

@@ -115,6 +115,79 @@ describe('AgentBrowserPanel', () => {
     vi.restoreAllMocks();
   });
 
+  it('shows an empty work hint without starting or recovering a conversation', async () => {
+    const original = hostApiFetchMock.getMockImplementation()!;
+    hostApiFetchMock.mockImplementation(async (path: string, init?: RequestInit) => {
+      if (path === '/api/agent-browser/ensure-work') return { status: 'empty' };
+      return original(path, init);
+    });
+    const onOpenChange = vi.fn();
+    const onWorkConversation = vi.fn();
+    const onRecovery = vi.fn();
+    render(<AgentBrowserPanel projectId="project-a" conversationId="c1" embedded open
+      onOpenChange={onOpenChange} onWorkConversation={onWorkConversation} onRecovery={onRecovery} />);
+
+    expect(await screen.findByRole('status')).toHaveTextContent('还没有作品，快和老师聊聊吧');
+    expect(screen.queryByText('正在打开你的作品…')).not.toBeInTheDocument();
+    expect(screen.queryByText('准备好后，页面会自动出现在这里。')).not.toBeInTheDocument();
+    expect(screen.queryByRole('button', { name: /再试一次|帮我检查并打开|重新打开作品|登录并继续/ })).not.toBeInTheDocument();
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument();
+    await waitFor(() => expect(latestPresentation()).toMatchObject({ visible: false }));
+    expect(onWorkConversation).not.toHaveBeenCalled();
+    expect(onRecovery).not.toHaveBeenCalled();
+    expect(onOpenChange).not.toHaveBeenCalled();
+    fireEvent.click(screen.getByRole('button', { name: '回到操作对话' }));
+    expect(onOpenChange).toHaveBeenCalledWith(false);
+    expect(hostApiFetchMock.mock.calls.filter(([path]) => path === '/api/agent-browser/ensure-work')).toHaveLength(1);
+  });
+
+  it('replaces an earlier presentation failure with the empty hint and can later show a work', async () => {
+    const original = hostApiFetchMock.getMockImplementation()!;
+    let result: 'ready' | 'empty' = 'ready';
+    let unavailable = true;
+    hostApiFetchMock.mockImplementation(async (path: string, init?: RequestInit) => {
+      if (path === '/api/agent-browser/ensure-work' && result === 'empty') return { status: 'empty' };
+      if (path === '/api/agent-browser/present' && body(init).visible && unavailable) throw new Error('开发浏览器已关闭。');
+      return original(path, init);
+    });
+    render(<AgentBrowserPanel projectId="project-a" embedded open onOpenChange={vi.fn()} />);
+    await screen.findByRole('button', { name: '重新打开作品' });
+    result = 'empty';
+    act(() => window.dispatchEvent(new Event('focus')));
+    await waitFor(() => expect(screen.getByRole('status')).toHaveTextContent('还没有作品，快和老师聊聊吧'));
+    expect(screen.queryByRole('button', { name: '重新打开作品' })).not.toBeInTheDocument();
+    expect(screen.queryByRole('alert')).not.toBeInTheDocument();
+    result = 'ready';
+    unavailable = false;
+    act(() => window.dispatchEvent(new Event('focus')));
+    await waitFor(() => expect(latestPresentation()).toMatchObject({ visible: true }));
+    expect(screen.queryByText('还没有作品，快和老师聊聊吧')).not.toBeInTheDocument();
+  });
+
+  it('checks and displays a host-opened work while the empty work tab stays open', async () => {
+    const original = hostApiFetchMock.getMockImplementation()!;
+    let opened = false;
+    hostApiFetchMock.mockImplementation(async (path: string, init?: RequestInit) => {
+      if (path === '/api/agent-browser/ensure-work' && !opened) return { status: 'empty' };
+      if (path.startsWith('/api/agent-browser/state?') && !opened) {
+        return { success: true, browser: snapshot({ browserId: null, state: 'closed', url: '' }) };
+      }
+      return original(path, init);
+    });
+    const onWorkConversation = vi.fn();
+    render(<AgentBrowserPanel projectId="project-a" embedded open onOpenChange={vi.fn()} onWorkConversation={onWorkConversation} />);
+    await waitFor(() => expect(screen.getByRole('status')).toHaveTextContent('还没有作品，快和老师聊聊吧'));
+    opened = true;
+    act(() => hostEventListeners.get('agent-browser:show')?.(snapshot()));
+
+    await waitFor(() => expect(latestPresentation()).toMatchObject({ visible: true }));
+    expect(screen.queryByText('还没有作品，快和老师聊聊吧')).not.toBeInTheDocument();
+    expect(onWorkConversation).not.toHaveBeenCalled();
+    const checks = hostApiFetchMock.mock.calls.filter(([path]) => path === '/api/agent-browser/ensure-work');
+    expect(checks).toHaveLength(2);
+    expect(body(checks[1][1]).request_id).toBe(body(checks[0][1]).request_id);
+  });
+
   it('offers login recovery instead of repeatedly trying to start the page', async () => {
     const original = hostApiFetchMock.getMockImplementation()!;
     hostApiFetchMock.mockImplementation(async (path: string, init?: RequestInit) => path === '/api/agent-browser/ensure-work'