fix(core): add retry pattern to breadcrumb E2E test for cache tolerance

The nested web page breadcrumb test fails consistently because the
backend PageTree cache (60s TTL) is not invalidated on page creation.
Wrap breadcrumb assertions in a retry-with-reload loop (matching the
established pattern in product.spec.ts) to tolerate cache propagation
delay.

Refs TRAC-281
Co-Authored-By: Claude <noreply@anthropic.com>

Author: chanceaclark

core/tests/ui/e2e/webpages.spec.ts

@@ -43,6 +43,10 @@ test('Nested web pages display the children in the side menu, navigate correctly
   page,
   webPage,
 }) => {
+  // Breadcrumb assertions depend on a backend PageTree cache (60s TTL) being invalidated after
+  // page creation. Retry with page reloads to tolerate cache propagation delay.
+  test.setTimeout(90000);
+
   const t = await getTranslations('WebPages.Normal');
   const parent = await webPage.create();
   const child1 = await webPage.create({ parentId: parent.id });
@@ -67,11 +71,23 @@ test('Nested web pages display the children in the side menu, navigate correctly
 
   const breadcrumbs = page.getByLabel('breadcrumb');
 
-  await expect(breadcrumbs.getByText(t('home'))).toBeVisible();
-  await expect(breadcrumbs.getByText(parent.name)).toBeVisible();
-  await expect(breadcrumbs.getByText('...')).toBeVisible();
-  await expect(breadcrumbs.getByText(nestedChild.name)).toBeVisible();
-  await expect(breadcrumbs.getByText(nestedChild2.name)).toBeVisible();
+  await expect(async () => {
+    try {
+      await expect(breadcrumbs.getByText(t('home'))).toBeVisible();
+      await expect(breadcrumbs.getByText(parent.name)).toBeVisible();
+      await expect(breadcrumbs.getByText('...')).toBeVisible();
+      await expect(breadcrumbs.getByText(nestedChild.name)).toBeVisible();
+      await expect(breadcrumbs.getByText(nestedChild2.name)).toBeVisible();
+    } catch {
+      await page.reload();
+      await page.waitForLoadState('networkidle');
+      await expect(breadcrumbs.getByText(t('home'))).toBeVisible();
+      await expect(breadcrumbs.getByText(parent.name)).toBeVisible();
+      await expect(breadcrumbs.getByText('...')).toBeVisible();
+      await expect(breadcrumbs.getByText(nestedChild.name)).toBeVisible();
+      await expect(breadcrumbs.getByText(nestedChild2.name)).toBeVisible();
+    }
+  }).toPass({ timeout: 90000, intervals: [2000] });
 });
 
 test('Contact page works with all fields and submits successfully', async ({ page, webPage }) => {