autoHideOnModal property
When true (default), destroys the native group's PlatformView while a
modal sheet is presented above this widget's host route. Fixes the
iOS hybrid-composition z-order bleed (Issue #53) where host-page
PlatformView pixels can leak through a sheet that also contains
CN-widgets. Requires CNTabBarRouteObserver() to be registered in
the app's navigatorObservers. No effect on iOS < 26 / non-iOS
(Flutter fallback).
Implementation
final bool autoHideOnModal;