### Description Add an E2E test to verify the grid view displays correctly on the DAG detail page. <img width="1682" height="575" alt="Image" src="https://github.com/user-attachments/assets/a85bc08a-a4aa-4d53-9784-407ba5dd2578" /> ### What to test - Navigate to a specific DAG's detail page (`/dags/:dagId`) - Switch to grid view - Verify grid renders with task instances - Verify task states are color-coded correctly - Verify clicking a cell shows task details Related issues https://github.com/apache/airflow/issues/59028