test(web): verify reasoning header alignment and sticky container

apps/web/tests/cot-translation.e2e.ts

@@ -238,6 +238,10 @@ it.skipIf(MODE === 'record')('persists Bing reasoning translation across reopen
   expect(await typography()).toEqual(translatedTypography)
   await page.mouse.move(0, 0)
   const translationAction = reasoning.getByRole('button', { name: '查看译文', exact: true })
+  const titleBox = await reasoning.getByRole('button', { name: '思考', exact: true }).boundingBox()
+  const actionBox = await translationAction.boundingBox()
+  if (titleBox === null || actionBox === null) throw new Error('Reasoning title and translation action must be visible')
+  expect(actionBox.y + actionBox.height / 2).toBeCloseTo(titleBox.y + titleBox.height / 2, 1)
   expect(await translationAction.evaluate(element => getComputedStyle(element).opacity)).toBe('1')
   await translationAction.click()
   await composer.focus()

apps/web/tests/lifecycle-chrome.e2e.ts

@@ -399,14 +399,13 @@ describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', ()
     const processWasOpen = await process.getAttribute('aria-expanded') === 'true'
     try {
       await expandOwningTurnProcess(page, thinkRow)
-      const collapsedHeader = thinkRow.locator('[data-disclosure-row]').first()
+      const collapsedHeader = thinkRow.locator('[data-disclosure-header]').first()
       await collapsedHeader.waitFor({ timeout: 10_000 })
       // Collapsed, the rule's `data-open` gate is absent and the header stays in
-      // flow. It is `relative` here — the row is the sweep-glare overlay anchor
-      // — so the assertion is the absence of `sticky`, not a specific value.
+      // flow, so assert the absence of `sticky`, not a specific value.
       expect(await collapsedHeader.evaluate(element => getComputedStyle(element).position)).not.toBe('sticky')
-      await collapsedHeader.click()
-      const openHeader = page.locator('[data-variant="think"] [data-open] [data-disclosure-row]').first()
+      await collapsedHeader.locator('[data-disclosure-row]').click()
+      const openHeader = page.locator('[data-variant="think"] [data-open] [data-disclosure-header]').first()
       await openHeader.waitFor({ timeout: 10_000 })
       const openStyle = await openHeader.evaluate((element) => {
         const style = getComputedStyle(element)