refactor tab bar behaviour; respect scroll preferences of websites;

app/lib/features/geckoview/domain/providers/tab_state.dart

@@ -87,6 +87,7 @@ class TabStates extends _$TabStates {
       isPrivate: contentState.isPrivate,
       isFullScreen: contentState.isFullScreen,
       isLoading: contentState.isLoading,
+      showToolbarAsExpanded: contentState.showToolbarAsExpanded,
     );
 
     _updateState({...state}..[contentState.id] = newState);

app/lib/features/geckoview/domain/providers/tab_state.g.dart

@@ -41,7 +41,7 @@ final class TabStatesProvider
   }
 }
 
-String _$tabStatesHash() => r'985d2eb87c59c3a113b8bbcf9d96267c42a2f543';
+String _$tabStatesHash() => r'975de1242f42e2017754dc560125788b83ad8b72';
 
 abstract class _$TabStates extends $Notifier<Map<String, TabState>> {
   Map<String, TabState> build();