Merge welcome dismissal while preserving continuous conversation entry

tests/unit/teacher-companion.test.tsx

@@ -468,6 +468,73 @@ describe('teacher presence and periodic guidance', () => {
     expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
   });
 
+  it('consumes the static greeting when consultation opens through the avatar and remembers it for the project', async () => {
+    const greeting = '有什么编程问题想一起讨论？';
+    api.config.mockResolvedValue({ enabled: true, definition: { ...definition, welcome_message: greeting } });
+    const view = await mount();
+    expect(screen.getByTestId('teacher-invitation')).toHaveAttribute('data-bubble-kind', 'welcome');
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    expect(within(screen.getByTestId('teacher-chat-panel')).getByText(greeting)).toBeVisible();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    expect(screen.queryByTestId('teacher-chat-panel')).not.toBeInTheDocument();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    expect(screen.getByTestId('teacher-chat-panel')).toBeVisible();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    view.unmount();
+    const next = await mount();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    await act(async () => next.rerender(<Harness projectId="other" />));
+    expect(screen.getByTestId('teacher-invitation')).toHaveAttribute('data-bubble-kind', 'welcome');
+    expect(api.create).not.toHaveBeenCalled();
+    expect(api.send).not.toHaveBeenCalled();
+    expect(api.checkIn).not.toHaveBeenCalled();
+  });
+
+  it.each([false, true])('consumes the static greeting when consultation opens before config loads (closed before load: %s)', async (closeBeforeLoad) => {
+    const config = { enabled: true, definition: { ...definition, welcome_message: '欢迎一起创作' } };
+    let resolve!: (value: typeof config) => void;
+    api.config.mockImplementationOnce(() => new Promise<typeof config>((done) => { resolve = done; }));
+    api.config.mockResolvedValue(config);
+    const view = await mount();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    if (closeBeforeLoad) {
+      await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    }
+    await act(async () => resolve(config));
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    if (!closeBeforeLoad) {
+      await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    }
+    expect(screen.queryByTestId('teacher-chat-panel')).not.toBeInTheDocument();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    view.unmount();
+    await mount();
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    expect(api.create).not.toHaveBeenCalled();
+    expect(api.send).not.toHaveBeenCalled();
+    expect(api.checkIn).not.toHaveBeenCalled();
+  });
+
+  it('consumes only the static greeting on avatar entry and leaves a real unread check-in until explicitly viewed', async () => {
+    api.config.mockResolvedValue({ enabled: true, definition: { ...definition, welcome_message: '欢迎一起创作' } });
+    api.list.mockResolvedValue({ items: [{ id: 'topic-project' }], lastSelectedTopicId: 'topic-project' });
+    api.read.mockResolvedValue(checkInTopic());
+    await mount();
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    expect(screen.getByTestId('teacher-invitation')).toHaveAttribute('data-bubble-kind', 'check-in');
+    expect(screen.getByTestId('teacher-invitation')).toHaveTextContent('排行榜');
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '看看智能体说的' })));
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '智能体', exact: true })));
+    expect(screen.queryByTestId('teacher-invitation')).not.toBeInTheDocument();
+    expect(api.create).not.toHaveBeenCalled();
+    expect(api.send).not.toHaveBeenCalled();
+    expect(api.checkIn).not.toHaveBeenCalled();
+  });
+
   it('keeps the elapsed interval when the Renderer reloads instead of starting another five-minute wait', async () => {
     const first = await mount();
     await advance(4 * 60_000);