gesture feature initial

apps/weblibre/lib/features/settings/presentation/screens/settings.dart

@@ -112,6 +112,13 @@ _CategoryGroups _buildCategories() {
       sections: browsingSettingsSections,
       onTap: (context) => BrowsingSettingsRoute().push(context),
     ),
+    _SettingsCategoryDefinition(
+      title: 'Gestures',
+      subtitle: 'Stroke gestures for browser actions',
+      icon: MdiIcons.gestureSwipe,
+      keywords: const ['gesture', 'swipe', 'stroke'],
+      onTap: (context) => GestureSettingsRoute().push(context),
+    ),
     _SettingsCategoryDefinition(
       title: 'Toolbar & Layout',
       subtitle: 'Tab bar, toolbar, quick switcher, tab view',

apps/weblibre/lib/features/settings/presentation/widgets/settings_detail.dart

@@ -167,6 +167,7 @@ class SettingsCustomScrollScaffold extends StatelessWidget {
   final TextEditingController? searchController;
   final String searchHintText;
   final List<Widget> slivers;
+  final Widget? floatingActionButton;
 
   const SettingsCustomScrollScaffold({
     super.key,
@@ -175,11 +176,13 @@ class SettingsCustomScrollScaffold extends StatelessWidget {
     this.actions = const [],
     this.searchController,
     this.searchHintText = 'Search settings',
+    this.floatingActionButton,
   });
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      floatingActionButton: floatingActionButton,
       body: SafeArea(
         child: FadingScroll(
           fadingSize: 25,