test(studio): the poll test waits through four quiet windows before it counts, and its failure says how many milliseconds after the baseline each commit landed

desktop/frontend-next/src/ui/useWorkbenchFiles.poll.test.tsx

@@ -16,13 +16,13 @@ const tick = () => act(async () => { await vi.advanceTimersByTimeAsync(3000); })
 /** Waits until the panel has stopped committing on its own: what opening a file
  *  leaves behind (an entering tab's 220ms timer, a lazily loaded chunk, a
  *  persisted list) lands at a time that depends on the machine, and none of it
- *  is what a poll does. Two quiet 50ms windows in a row end the wait; a panel
+ *  is what a poll does. Four quiet 100ms windows in a row end the wait; a panel
  *  that never goes quiet leaves the real assertion to fail. */
 async function quiet(commits: ReturnType<typeof vi.fn>) {
   let still = 0;
-  for (let i = 0; i < 60 && still < 2; i++) {
+  for (let i = 0; i < 60 && still < 4; i++) {
     commits.mockClear();
-    await act(async () => { await new Promise((resolve) => setTimeout(resolve, 50)); });
+    await act(async () => { await new Promise((resolve) => setTimeout(resolve, 100)); });
     still = commits.mock.calls.length === 0 ? still + 1 : 0;
   }
 }
@@ -114,10 +114,11 @@ it("leaves the rendered Workbench untouched when Markdown polls are unchanged",
   await act(async () => {});
   await quiet(commits);
   commits.mockClear();
+  const base = performance.now();
   const seen: string[] = [];
   for (const n of [1, 2]) {
     await tick();
-    seen.push(`after poll ${n}: ${commits.mock.calls.length} commits [${commits.mock.calls.map((c) => c[1]).join(",")}], file reads ${read.mock.calls.length}, listings ${listed.mock.calls.length}`);
+    seen.push(`after poll ${n} (${(performance.now() - base).toFixed(0)}ms): ${commits.mock.calls.length} commits [${commits.mock.calls.map((c) => `${c[1]}@${(c[5] - base).toFixed(0)}ms`).join(",")}], file reads ${read.mock.calls.length}, listings ${listed.mock.calls.length}`);
   }
   expect(read).toHaveBeenCalledTimes(3);
   expect(commits.mock.calls.length, seen.join("; ")).toBe(0);