Test Case: Mark notification tests › Mark notification as unread

Failure Message: TimeoutError: page.waitForSelector: Timeout 10000ms exceeded. Call log: - waiting for locator('nav a') to be visible

Root Cause Analysis: The application fails to render the main content view after login, causing the test to time out. The screenshot shows that while the navigation sidebar is present, the main content area is completely blank, which indicates an application or data loading error.