refactor: use gesture detector

packages/pinball_ui/lib/src/widgets/pinball_button.dart

@@ -30,10 +30,8 @@ class PinballButton extends StatelessWidget {
           ),
         ),
         child: Center(
-          child: InkWell(
+          child: GestureDetector(
             onTap: onTap,
-            splashColor: PinballColors.transparent,
-            highlightColor: PinballColors.transparent,
             child: Padding(
               padding: const EdgeInsets.symmetric(
                 horizontal: 32,

packages/pinball_ui/lib/src/widgets/pinball_dpad_button.dart

@@ -53,10 +53,8 @@ class PinballDpadButton extends StatelessWidget {
   Widget build(BuildContext context) {
     return Material(
       color: PinballColors.transparent,
-      child: InkWell(
+      child: GestureDetector(
         onTap: onTap,
-        splashColor: PinballColors.transparent,
-        highlightColor: PinballColors.transparent,
         child: Image.asset(
           direction.toAsset(),
           width: 60,