Add teacher microphone and per-question model selection

tests/unit/coding-teacher-ui.test.tsx

@@ -3,6 +3,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { TeacherChatPanel } from '@/pages/Chat/TeacherChatPanel';
 import type { TeacherDefinition, TeacherRequest, TeacherSend, TeacherTopic } from '../../shared/coding-teacher';
 const api = vi.hoisted(() => ({
+  models: vi.fn(),
   catalog: vi.fn(),
   config: vi.fn(),
   preview: vi.fn(),
@@ -70,6 +71,7 @@ beforeEach(() => {
   vi.resetAllMocks();
   localStorage.clear();
   streams = new Map();
+  api.models.mockResolvedValue({ supported: true, models: [{ id: 'qwen' }, { id: 'other-model' }] });
   api.config.mockResolvedValue({ enabled: true, published_version: 1, revision: 1, definition });
   api.catalog.mockResolvedValue({ items: [{ teacher_id: 'one', version: 1, definition, is_default: true }] });
   api.conversation.mockResolvedValue({ topic: null, before: null });
@@ -1008,3 +1010,19 @@ describe('merged cloud teacher classroom', () => {
     expect(screen.getByRole('button', { name: '智能体新话题' })).toBeEnabled();
   });
 });
+
+ it('selects a teacher model for the next send and retains it after remount', async () => {
+   const view = render(<TeacherChatPanel projectId="p" sourceId="c" />);
+   await ready();
+   const trigger = screen.getByRole('button', { name: /老师模型/ });
+   fireEvent.keyDown(trigger, { key: 'Enter' });
+   fireEvent.click(await screen.findByRole('menuitemradio', { name: 'other-model' }));
+   fireEvent.change(screen.getByRole('textbox', { name: '向智能体提问' }), { target: { value: '我的想法' } });
+   api.send.mockResolvedValue(first);
+   fireEvent.click(screen.getByRole('button', { name: '提问' }));
+   await waitFor(() => expect(api.send).toHaveBeenCalledWith('p/agent-topics', 'first', expect.objectContaining({ modelId: 'other-model', text: '我的想法' })));
+   view.unmount();
+   render(<TeacherChatPanel projectId="p" sourceId="c" />);
+   await screen.findByRole('button', { name: /老师模型：other-model/ });
+   expect(screen.getByRole('button', { name: '语音输入' })).toBeInTheDocument();
+ });