refactoring

app/lib/features/geckoview/domain/controllers/overlay.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/widgets.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'overlay.g.dart';
+
+@Riverpod()
+class OverlayController extends _$OverlayController {
+  @override
+  Widget? build() {
+    return null;
+  }
+
+  // ignore: use_setters_to_change_properties api decision
+  void show(Widget dialog) {
+    state = dialog;
+  }
+
+  void dismiss() {
+    state = null;
+  }
+}