test(web): isolate heartbeat replay and sample panel geometry atomically

apps/web/tests/shortcuts-panels.e2e.ts

@@ -127,10 +127,16 @@ describe.skipIf(process.platform === 'win32')('Web sidebar shortcuts', () => {
 
       const terminalEntry = panel.locator('[data-sidebar-right-guide-entry="terminal"]')
       const shellMenu = terminalEntry.getByRole('button', { name: 'Choose shell', exact: true })
-      const titleBounds = await terminalEntry.getByText('New terminal', { exact: true }).boundingBox()
-      const arrowBounds = await shellMenu.boundingBox()
-      expect(arrowBounds!.x).toBeGreaterThanOrEqual(titleBounds!.x + titleBounds!.width)
-      expect(arrowBounds!.x - titleBounds!.x - titleBounds!.width).toBeLessThan(8)
+      // Sample both rectangles in one layout instead of crossing the panel's transition frames.
+      await expect.poll(() => terminalEntry.evaluate((entry) => {
+        const title = [...entry.querySelectorAll('span[aria-hidden="true"]')].find(element => element.textContent === 'New terminal')
+        const arrow = entry.querySelector('button[aria-label="Choose shell"]')
+        if (title === undefined || arrow === null) return null
+        const titleBounds = title.getBoundingClientRect()
+        const arrowBounds = arrow.getBoundingClientRect()
+        const gap = arrowBounds.left - titleBounds.right
+        return { ordered: gap >= 0, adjacent: gap < 8 }
+      })).toEqual({ ordered: true, adjacent: true })
       await shellMenu.click()
       await page.getByRole('menu').waitFor()
       expect(await panel.locator('[data-sidebar-terminal]').count()).toBe(0)

scripts/run-web-snapshots.ts

@@ -5,6 +5,8 @@ import { pnpmInvocation } from './pnpm-invocation.ts'
 const serialFiles = [
   'apps/web/tests/hmr-live.e2e.ts',
   'apps/web/tests/client-plugin-live.e2e.ts',
+  // Recorded SVG streaming retains live heartbeat assertions; reserve its browser CPU budget.
+  'apps/web/tests/present-svg.e2e.ts',
 ]
 const workerRaw = process.env.DSH_WEB_SNAPSHOT_WORKERS
 const workers = Number.parseInt(workerRaw ?? '', 10)