[dev-overlay] HOTFIX: clicking nav escapes the overlay (#75876)
Following up of #75679
### Why?
Clicking the navigation escapes the overlay. It is because the
navigation component is outside of the dialog component.
#### Before
https://github.com/user-attachments/assets/e7c63261-c44b-4af7-936d-1750dff07527
#### After
https://github.com/user-attachments/assets/979421fa-fb71-481d-bd58-6703298db28b
### How?
Since we already have logic to prevent closing overlay when clicked
outside the component for dev indicator, add the header to this CSS
selectors list as well.
