feat(chat): add manual refresh for delivered agents

tests/e2e/teacher-preview-layout.spec.ts

@@ -40,7 +40,10 @@ for (const width of [520, 1000]) {
     await page.setViewportSize({ width, height: 800 });
     await page.goto(baseUrl + '?agents=8');
     const tabs = page.getByRole('navigation', { name: '已下发智能体' });
+    const refresh = page.getByRole('button', { name: '刷新智能体', exact: true });
     await expect(tabs.getByRole('button')).toHaveCount(8);
+    await expect(refresh).toBeVisible();
+    await expect(tabs.getByRole('button', { name: '刷新智能体', exact: true })).toHaveCount(0);
     await expect(page.getByRole('combobox', { name: '新话题使用的智能体' })).toHaveCount(0);
     const last = tabs.getByRole('button', { name: '与智能体8聊天' });
     await last.focus();
@@ -48,13 +51,22 @@ for (const width of [520, 1000]) {
     await expect(last).toHaveAttribute('aria-pressed', 'true');
     const bounds = await page.evaluate(() => {
       const strip = document.querySelector('.consultation-agent-tabs')!;
+      const refresh = document.querySelector('button[aria-label="刷新智能体"]')!;
       const controls = document.querySelector('[data-testid="window-controls"]')!;
       return { right: strip.getBoundingClientRect().right, controlsLeft: controls.getBoundingClientRect().left,
+        refreshLeft: refresh.getBoundingClientRect().left, refreshRight: refresh.getBoundingClientRect().right,
         scroll: strip.scrollLeft, documentWidth: document.documentElement.scrollWidth };
     });
-    expect(bounds.right).toBeLessThanOrEqual(bounds.controlsLeft);
+    expect(bounds.right).toBeLessThanOrEqual(bounds.refreshLeft);
+    expect(bounds.refreshRight).toBeLessThanOrEqual(bounds.controlsLeft);
     expect(bounds.documentWidth).toBeLessThanOrEqual(width);
     expect(bounds.scroll).toBeGreaterThan(0);
+    await refresh.click();
+    await expect(tabs.getByRole('button')).toHaveCount(9);
+    await expect(page.getByRole('status').filter({ hasText: '已更新' })).toBeVisible();
+    await expect(last).toHaveAttribute('aria-pressed', 'true');
+    await expect(refresh).toBeInViewport();
+    await expect(refresh).toBeEnabled();
     await page.screenshot({ path: test.info().outputPath('distributed-agents-titlebar.png') });
   });
 }