test(web): cover optimized streaming paths

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

@@ -188,10 +188,16 @@ describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', ()
         await input.press('Enter')
         if (MODE !== 'record') {
           const liveTail = page.locator('[data-variant="think"][data-state="running"] [data-follow-end]')
-          await expect.poll(async () => await liveTail.evaluate(element => (
-            element.scrollWidth > element.clientWidth
-              && element.scrollLeft >= element.scrollWidth - element.clientWidth - 1
-          )), { timeout: 10_000, interval: 10 }).toBe(true)
+          await expect.poll(async () => {
+            if (await liveTail.count() !== 1) return false
+            return await liveTail.evaluate((element) => {
+              const text = element.firstElementChild
+              if (!(text instanceof HTMLElement)) return false
+              const viewport = element.getBoundingClientRect()
+              const content = text.getBoundingClientRect()
+              return content.width > viewport.width && Math.abs(content.right - viewport.right) <= 1
+            })
+          }, { timeout: 10_000, interval: 10 }).toBe(true)
         }
         return await settled
       } finally {

packages/client/ui-deliverables/tests/produced-files.client.spec.tsx

@@ -382,6 +382,9 @@ describe('produced-file Turn data', () => {
     value.append(call(4, 'second', 'edit', {
       file_path: 'second.txt', old_string: 'before', new_string: 'after',
     }))
+    value.flush()
+    expect(deliverablesOf(value)).toBe(first)
+
     value.append(result(5, 'second'))
     value.flush()
     expect(producedForClosing(deliverablesOf(value))).toEqual(['first.txt', 'second.txt'])