test(web): adapt workspace browser e2e interactions to the compact sidebar

The sidebar redesign removed group session counts, collapsed search into a
header action, and moved grouping into the View options menu. Update the
browser scenarios that waited on the old surfaces:

- Wait on the Ungrouped bucket row instead of the removed session-count text.
- Expand the collapsed search control before filling the renamed input.
- Open the View options menu instead of the removed Group by button.
- Assert the persisted grouping under the new dsh.workspace.view.v4 key.
- built-boot: assert the fixture workspace group row instead of its count.

apps/web/tests/trajectory-virtualization.e2e.ts

@@ -59,7 +59,10 @@ interface RowAnchor {
 }
 
 async function openSeed(page: Page): Promise<void> {
-  const search = page.getByRole('textbox', { name: 'Search name, keywords...', exact: true })
+  // Search collapsed into a header action; expand it before filling.
+  const searchButton = page.getByRole('button', { name: 'Search sessions' })
+  if (await searchButton.getAttribute('aria-expanded') !== 'true') await searchButton.click()
+  const search = page.getByRole('textbox', { name: 'Search sessions...', exact: true })
   await search.fill(FIXTURE.markers.user(1))
   const result = page.getByRole('tree', { name: 'Search results' }).getByRole('treeitem')
   await expect.poll(() => result.count(), { timeout: 60_000 }).toBe(1)
@@ -182,7 +185,9 @@ describe('web e2e: Trajectory virtualization over tail-paged history', () => {
     tripwire = watchConsole(page)
     await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
     await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
-    await page.getByText('1 session', { exact: true }).waitFor({ timeout: 30_000 })
+    // The compact layout dropped group session counts; the seeded baseline is
+    // the Ungrouped bucket once cold summaries load.
+    await page.getByText('Ungrouped', { exact: true }).waitFor({ timeout: 30_000 })
   }, 120_000)
 
   afterAll(async () => {