new favourites feature

lib/widgets/skip_build_when_covered.dart

@@ -8,6 +8,9 @@ final RouteObserver<ModalRoute<void>> appRouteObserver =
     RouteObserver<ModalRoute<void>>();
 
 /// Builds via [builder] only when this route is not covered by a pushed page.
+///
+/// Uses [ModalRoute.isCurrent] so nested dialogs above a bottom sheet do not
+/// falsely "uncover" the page when the dialog pops (sheet still open).
 class SkipBuildWhenCovered extends StatefulWidget {
   const SkipBuildWhenCovered({
     super.key,
@@ -26,6 +29,13 @@ class _SkipBuildWhenCoveredState extends State<SkipBuildWhenCovered>
     with RouteAware {
   var _covered = false;
 
+  void _syncCovered() {
+    final route = ModalRoute.of(context);
+    final covered = route != null && !route.isCurrent;
+    if (covered == _covered) return;
+    setState(() => _covered = covered);
+  }
+
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
@@ -33,6 +43,7 @@ class _SkipBuildWhenCoveredState extends State<SkipBuildWhenCovered>
     if (route is PageRoute) {
       appRouteObserver.subscribe(this, route);
     }
+    _syncCovered();
   }
 
   @override
@@ -42,14 +53,10 @@ class _SkipBuildWhenCoveredState extends State<SkipBuildWhenCovered>
   }
 
   @override
-  void didPushNext() {
-    if (!_covered) setState(() => _covered = true);
-  }
+  void didPushNext() => _syncCovered();
 
   @override
-  void didPopNext() {
-    if (_covered) setState(() => _covered = false);
-  }
+  void didPopNext() => _syncCovered();
 
   @override
   Widget build(BuildContext context) {