test(e2e): revert waitForArchivePersistence after remote sync

This reverts the wait added in commit 134e08c75.

The waitForArchivePersistence() call after remote archive sync causes
the test to timeout completely - the page cannot execute JavaScript
and the test fails after 270 seconds.

Without this wait, the test progresses further and the UI does render
(Task2 is visible in screenshots), but the Playwright locator query
times out. This is a different issue that requires further investigation.

Current status:
- 12 out of 13 WebDAV archive sync tests passing
- 1 test still failing but no longer freezing the browser

e2e/tests/sync/webdav-sync-archive.spec.ts

@@ -185,9 +185,6 @@ test.describe('@webdav WebDAV Archive Sync', () => {
     await waitForSyncComplete(pageA, syncPageA);
     console.log('[Archive Diff] Client A synced to get B changes');
 
-    // Wait for archive persistence after remote sync (same as after local archive operations)
-    await waitForArchivePersistence(pageA);
-
     // --- Verify final state ---
     // Both clients should have only Task2 visible
     await expect(pageA.locator('task')).toHaveCount(1);