autoHideOnModal property
When true (default), destroys the native popup menu'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 a host-page
CN-widget's pixels leak through a sheet that also contains a CN-widget.
Requires CNTabBarRouteObserver() to be registered in the app's
navigatorObservers. No effect on iOS < 26 / non-iOS (Flutter fallback).
When false, the native view stays while a modal (a dialog, popup or sheet) is up, and its Liquid Glass glow is clipped to the view's bounds from the modal's push until its exit animation ends, so no box shows around it through the modal's barrier (Issue #124).
Implementation
final bool autoHideOnModal;