fix: 显示下发智能体的云端图标

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

@@ -96,6 +96,16 @@ async function ready() {
   await waitFor(() => expect(streams.has('first')).toBe(true));
 }
 describe('teacher side chat', () => {
+  it('renders the pinned topic icon in the header and assistant messages', async () => {
+    const icon = 'https://yuxi.example.test/api/storage/public/images/topic.png';
+    api.read.mockResolvedValue({ ...first, definition: { ...definition, icon_url: icon }, requests: [request({ response: '继续原来的讨论' })] });
+    const view = render(<TeacherChatPanel projectId="p" sourceId="c" />);
+    await ready();
+    const images = view.container.querySelectorAll('[data-testid="teacher-chat-panel"] img');
+    expect(images).toHaveLength(2);
+    for (const img of images) expect(img).toHaveAttribute('src', icon);
+  });
+
   it('renders assistant Markdown, tables, code and images instead of literal markup', async () => {
     const response = '## 项目建议\n\n**先验证跳跃**\n\n- 保留现有玩法\n\n| 文件 | 用途 |\n| --- | --- |\n| main.ts | 入口 |\n\n```json\n{"name":"flybot"}\n```\n\n[说明](https://example.com/readme)\n\n![项目截图](https://example.com/preview.png)';
     api.read.mockResolvedValue({ ...first, requests: [request({ response })] });

tests/unit/teacher-companion.test.tsx

@@ -43,6 +43,24 @@ beforeEach(() => {
 afterEach(() => { cleanup(); vi.useRealTimers(); });
 
 describe('teacher presence and periodic guidance', () => {
+  it('uses each published icon in the topbar, welcome and panel, and falls back after an image error', async () => {
+    const a = { teacher_id: 'a', version: 1, is_default: true, definition: { ...definition, icon_url: 'https://yuxi.example.test/api/storage/public/images/a.png' } };
+    const b = { teacher_id: 'b', version: 2, is_default: false, definition: { ...definition, name: '另一个智能体', icon_url: 'https://yuxi.example.test/api/storage/public/images/b.webp' } };
+    api.catalog.mockResolvedValue({ items: [a, b] });
+    const view = await mount();
+    const first = screen.getByRole('button', { name: '与运营配置的智能体聊天' }).querySelector('img')!;
+    const second = screen.getByRole('button', { name: '与另一个智能体聊天' }).querySelector('img')!;
+    expect(first).toHaveAttribute('src', a.definition.icon_url);
+    expect(second).toHaveAttribute('src', b.definition.icon_url);
+    fireEvent.error(first);
+    expect(first.src).toContain('avatar-06.png');
+    expect(second).toHaveAttribute('src', b.definition.icon_url);
+    await act(async () => fireEvent.click(screen.getByRole('button', { name: '与另一个智能体聊天' })));
+    const images = view.container.querySelectorAll('[data-testid="teacher-chat-panel"] img');
+    expect(images).toHaveLength(2);
+    for (const img of images) expect(img).toHaveAttribute('src', b.definition.icon_url);
+  });
+
   it('shows every distributed agent in the header and preserves separate drafts without dispatching on switch', async () => {
     const a = { teacher_id: 'method', version: 3, is_default: true, definition: { ...definition, config_id: 'method', name: '方法老师' } };
     const b = { teacher_id: 'experience', version: 9, is_default: false, definition: { ...definition, config_id: 'experience', name: '体验朋友', avatar_id: 'avatar-09' } };