Full-screen offline overlay.
Rendered unconditionally at the root layout level.
Returns null when the device is online — costs nothing.
When offline it covers the entire screen (including the tab bar and all
navigable content) so no buttons or navigation elements are reachable.
NetInfo's addEventListener fires automatically when connectivity is
restored, so the overlay disappears without the user pressing Retry.
The Retry button re-runs NetInfo.fetch() for manual confirmation.
Full-screen offline overlay. Rendered unconditionally at the root layout level. Returns null when the device is online — costs nothing. When offline it covers the entire screen (including the tab bar and all navigable content) so no buttons or navigation elements are reachable.
NetInfo's addEventListener fires automatically when connectivity is restored, so the overlay disappears without the user pressing Retry. The Retry button re-runs NetInfo.fetch() for manual confirmation.