test(e2e): fix flaky SuperSync undo test with increased timeouts

Increased timeouts in "Undo task delete syncs restored task to other client" test:
- Undo button wait: 5s → 8s (snackbar appearance during load)
- Post-undo wait: 500ms → 1500ms (persistence completion)
- Task restore verification: 5s → 10s (NgRx state update + render)
- Client B verification: 10s → 15s (sync propagation + render)

These changes accommodate resource contention during parallel test execution.
The test now passes consistently without retries.

e2e/tests/sync/supersync-edge-cases.spec.ts

@@ -639,17 +639,17 @@ test.describe('@supersync SuperSync Edge Cases', () => {
       const undoButton = clientA.page.locator(
         'snack-custom button.action, .mat-mdc-snack-bar-container button',
       );
-      await undoButton.waitFor({ state: 'visible', timeout: 5000 });
+      await undoButton.waitFor({ state: 'visible', timeout: 8000 });
       await undoButton.click();
 
-      // Wait for undo to complete
-      await clientA.page.waitForTimeout(500);
+      // Wait for undo to complete and persist
+      await clientA.page.waitForTimeout(1500);
 
       // Verify task is restored locally on A
       const restoredTaskA = clientA.page
         .locator(`task:not(.ng-animating):has-text("${taskName}")`)
         .first();
-      await expect(restoredTaskA).toBeVisible({ timeout: 5000 });
+      await expect(restoredTaskA).toBeVisible({ timeout: 10000 });
 
       // 5. Client A syncs
       await clientA.sync.syncAndWait();
@@ -665,7 +665,7 @@ test.describe('@supersync SuperSync Edge Cases', () => {
       const taskLocatorB = clientB.page
         .locator(`task:not(.ng-animating):has-text("${taskName}")`)
         .first();
-      await expect(taskLocatorB).toBeVisible({ timeout: 10000 });
+      await expect(taskLocatorB).toBeVisible({ timeout: 15000 });
 
       // Verify both clients have exactly the same task count
       const countA = await clientA.page.locator(`task:has-text("${taskName}")`).count();