Initial public commit

lib/ui/common/app_scroll_behavior.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/gestures.dart';
+import 'package:wonders/common_libs.dart';
+
+/// Add mouse drag on desktop for easier responsive testing
+class AppScrollBehavior extends ScrollBehavior {
+  @override
+  Set<PointerDeviceKind> get dragDevices {
+    return Set.from(super.dragDevices)..add(PointerDeviceKind.mouse);
+  }
+
+  @override
+  ScrollPhysics getScrollPhysics(BuildContext context) => const BouncingScrollPhysics();
+
+  @override
+  Widget buildScrollbar(BuildContext context, Widget child, ScrollableDetails details) {
+    return RawScrollbar(controller: details.controller, child: child);
+  }
+}