fix: show and dismiss teacher introductions as one group

tests/e2e/pi-coding-first-chat.spec.ts

@@ -2322,6 +2322,42 @@ test('teacher introductions collapse after three operation replies and remain av
   } finally { await releaseSnapshot(electronApp); }
 });
 
+test('teacher introduction group closes all three and stays closed for a new teacher after refresh and reload', async ({ launchElectronApp }) => {
+  const electronApp = await launchElectronApp({ skipSetup: true });
+  let page = await getStableWindow(electronApp);
+  const connection = await page.evaluate(async () => ({ token: await window.electron.ipcRenderer.invoke('hostapi:token') as string, baseUrl: await window.electron.ipcRenderer.invoke('hostapi:base-url') as string }));
+  await installCodingFirstChatHost(electronApp, connection, true);
+  await settleSnapshot(electronApp);
+  await disableCodingEventSource(page);
+  const addTeacher = async (id: string) => electronApp.evaluate((_electron, id) => {
+    const state = (globalThis as typeof globalThis & { __makelorePiFirstChatE2E: TeacherCatalogFixture }).__makelorePiFirstChatE2E;
+    const original = state.teacherCatalog.items[0];
+    state.teacherCatalog.items.push({ ...original, teacher_id: id, is_default: false,
+      definition: { ...original.definition, config_id: id, name: id } });
+  }, id);
+  try {
+    await addTeacher('第三位老师');
+    await page.reload(); page = await getStableWindow(electronApp);
+    await page.getByTestId('ai-module-option-programming').click();
+    await page.evaluate(() => { window.location.hash = '/chat'; });
+    const group = page.getByTestId('teacher-welcomes');
+    await expect(group.locator('.teacher-welcome-card')).toHaveCount(3);
+    await group.getByRole('button', { name: '收起全部老师介绍（朋友）' }).click();
+    await expect(group).toHaveCount(0);
+    await expect(page.getByTestId('teacher-chat-panel')).toHaveCount(0);
+    await addTeacher('第四位老师');
+    await page.getByRole('button', { name: '刷新智能体', exact: true }).click();
+    await expect(page.getByRole('button', { name: '与第四位老师聊天', exact: true })).toBeVisible();
+    await expect(group).toHaveCount(0);
+    await page.reload();
+    await expect(page.getByRole('button', { name: '与第四位老师聊天', exact: true })).toBeVisible();
+    await expect(group).toHaveCount(0);
+    await page.getByRole('button', { name: '与代码智能体聊天', exact: true }).hover();
+    await expect(page.getByTestId('teacher-introduction')).toContainText('一起发现代码里的小奥秘');
+    expect((await readState(electronApp)).captured.filter(item => /\/(agent-topics|messages|teacher-check-in|prompt)$/.test(item.path) && item.method === 'POST')).toHaveLength(0);
+  } finally { await releaseSnapshot(electronApp); }
+});
+
 test('teacher avatar consumes the welcome bubble through close, reopen and reload without a model request', async ({ launchElectronApp }) => {
   const electronApp = await launchElectronApp({ skipSetup: true });
   let page = await getStableWindow(electronApp);
@@ -2353,7 +2389,7 @@ test('teacher avatar consumes the welcome bubble through close, reopen and reloa
     await page.reload();
     await expect(teacherButton).toBeVisible();
     await expect(invitation).toHaveCount(0);
-    await expect(page.getByRole('button', { name: '收起朋友的介绍' })).toBeVisible();
+    await expect(page.getByTestId('teacher-welcomes')).toHaveCount(0);
     expect((await readState(electronApp)).captured.filter(item => /\/(agent-topics|messages|teacher-check-in|prompt)$/.test(item.path) && item.method === 'POST')).toHaveLength(0);
   } finally { await releaseSnapshot(electronApp); }
 });
@@ -2447,8 +2483,8 @@ test('teacher stays in the top-right header without legacy check-ins or taking o
     expect(browserViewportBounds!.y).toBeGreaterThanOrEqual(workInvitationBounds!.y + workInvitationBounds!.height);
     const workPane = page.getByRole('tabpanel', { name: '作品', exact: true });
     const workPanel = page.getByTestId('agent-browser-panel');
-    // Account for existing DOM toolbars instead of reserving a full bubble row.
-    expect((await workPanel.boundingBox())!.y - (await workPane.boundingBox())!.y).toBeLessThan(65);
+    // Clear the entire group with only a small gap above the native viewport.
+    expect(browserViewportBounds!.y - (workInvitationBounds!.y + workInvitationBounds!.height)).toBeLessThanOrEqual(9);
     await page.getByRole('tab', { name: '操作对话', exact: true }).click();
     await expect(composer).toHaveValue('我还在写自己的想法');
     await page.clock.fastForward(300_000);