Verify one expanded summary in the desktop workbench (U5)

Why: Opening the auxiliary work pane should keep the conversation compact.

Evidence: Existing Playwright browser suite passed all 10 cases, including finished Collapsible transition.

Impact: Test and screenshot timing only; product behavior is unchanged.

Refs: Dev feature/work-companion-ui, UI03

e2e/work-companion.playwright.ts

@@ -114,6 +114,17 @@ test('keeps real summary and details accessible with right pane closed', async (
   expect(state.errors).toEqual([])
 })
 
+test('keeps one expanded ordinary summary when the desktop work pane opens', async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 960 })
+  const state = await fixture(page)
+  await page.getByRole('button', { name: '打开工作', exact: true }).click()
+  await expect(page.locator('.right-panel .acard')).toHaveCount(1)
+  await expect(page.locator('[data-conversation-work] .acard')).toHaveCount(0)
+  await expect(page.locator('[data-conversation-work]').getByRole('button', { name: /整理项目材料 · 查看摘要/ })).toBeVisible()
+  if (process.env.WORK_COMPANION_SCREENSHOT) await page.screenshot({ path: process.env.WORK_COMPANION_SCREENSHOT, fullPage: true })
+  expect(state.errors).toEqual([])
+})
+
 test('shares submitting feedback between conversation and work confirmations', async ({ page }) => {
   const state = await fixture(page, [confirmation])
   await page.getByRole('button', { name: '打开工作', exact: true }).click()
@@ -177,7 +188,6 @@ for (const width of [1440, 1024, 736, 390, 320]) {
     }
     const layout = await page.evaluate(() => ({ width: document.documentElement.clientWidth, scroll: document.documentElement.scrollWidth }))
     expect(layout.scroll).toBeLessThanOrEqual(layout.width)
-    if (width === 1440 && process.env.WORK_COMPANION_SCREENSHOT) await page.screenshot({ path: process.env.WORK_COMPANION_SCREENSHOT, fullPage: true })
     expect(state.errors).toEqual([])
   })
 }