fix(web): activate contextual help and filter status

vehicle-data-platform/apps/web/src/v2/layout/AppShell.test.tsx

@@ -41,3 +41,19 @@ test('reschedules likely route preloads when the active module changes', async (
   cleanup();
   expect(secondCleanup).toHaveBeenCalledTimes(1);
 });
+
+test('opens contextual help for the active module and closes it without navigating', () => {
+  render(<MemoryRouter future={ROUTER_FUTURE} initialEntries={['/monitor']}>
+    <Routes><Route element={<AppShell />}><Route path="*" element={<span>页面内容</span>} /></Route></Routes>
+  </MemoryRouter>);
+
+  const help = screen.getByRole('button', { name: '帮助' });
+  expect(help).toHaveAttribute('aria-expanded', 'false');
+  fireEvent.click(help);
+
+  expect(screen.getByRole('dialog', { name: '全局监控' })).toHaveTextContent('筛选会自动生效');
+  expect(help).toHaveAttribute('aria-expanded', 'true');
+  fireEvent.click(screen.getByRole('button', { name: '关闭帮助' }));
+  expect(screen.queryByRole('dialog')).not.toBeInTheDocument();
+  expect(screen.getByText('页面内容')).toBeInTheDocument();
+});