refactor: load assets in sandbox stories

packages/pinball_components/lib/src/components/alien_bumper.dart

@@ -43,7 +43,7 @@ class AlienBumper extends BodyComponent with InitialPosition {
           majorRadius: 3.19,
           minorRadius: 2.79,
           onAssetPath: Assets.images.alienBumper.b.on.keyName,
-          offAssetPath: Assets.images.alienBumper.a.off.keyName,
+          offAssetPath: Assets.images.alienBumper.b.off.keyName,
         );
 
   final double _majorRadius;

packages/pinball_components/sandbox/lib/stories/alien_zone/alien_bumper_a_game.dart

@@ -17,6 +17,11 @@ class AlienBumperAGame extends BasicBallGame {
   Future<void> onLoad() async {
     await super.onLoad();
 
+    await Future.wait([
+      images.load(Assets.images.alienBumper.a.on.keyName),
+      images.load(Assets.images.alienBumper.a.off.keyName),
+    ]);
+
     final center = screenToWorld(camera.viewport.canvasSize! / 2);
     final alienBumperA = AlienBumper.a()
       ..initialPosition = Vector2(center.x - 20, center.y - 20)

packages/pinball_components/sandbox/lib/stories/alien_zone/alien_bumper_b_game.dart

@@ -17,6 +17,11 @@ class AlienBumperBGame extends BasicBallGame {
   Future<void> onLoad() async {
     await super.onLoad();
 
+    await Future.wait([
+      images.load(Assets.images.alienBumper.b.on.keyName),
+      images.load(Assets.images.alienBumper.b.off.keyName),
+    ]);
+
     final center = screenToWorld(camera.viewport.canvasSize! / 2);
     final alienBumperB = AlienBumper.b()
       ..initialPosition = Vector2(center.x - 10, center.y + 10)

packages/pinball_components/sandbox/lib/stories/flutter_forest/big_dash_nest_bumper_game.dart

@@ -15,9 +15,14 @@ class BigDashNestBumperGame extends BasicBallGame with Traceable {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
+
+    await Future.wait([
+      images.load(Assets.images.dash.bumper.main.active.keyName),
+      images.load(Assets.images.dash.bumper.main.inactive.keyName),
+    ]);
+
     camera.followVector2(Vector2.zero());
     await add(DashNestBumper.main()..priority = 1);
     await traceAllBodies();
-    await traceAllBodies();
   }
 }

packages/pinball_components/sandbox/lib/stories/flutter_forest/small_dash_nest_bumper_a_game.dart

@@ -15,9 +15,14 @@ class SmallDashNestBumperAGame extends BasicBallGame with Traceable {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
+
+    await Future.wait([
+      images.load(Assets.images.dash.bumper.a.active.keyName),
+      images.load(Assets.images.dash.bumper.a.inactive.keyName),
+    ]);
+
     camera.followVector2(Vector2.zero());
     await add(DashNestBumper.a()..priority = 1);
     await traceAllBodies();
-    await traceAllBodies();
   }
 }

packages/pinball_components/sandbox/lib/stories/flutter_forest/small_dash_nest_bumper_b_game.dart

@@ -15,9 +15,14 @@ class SmallDashNestBumperBGame extends BasicBallGame with Traceable {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
+
+    await Future.wait([
+      images.load(Assets.images.dash.bumper.b.active.keyName),
+      images.load(Assets.images.dash.bumper.b.inactive.keyName),
+    ]);
+
     camera.followVector2(Vector2.zero());
     await add(DashNestBumper.b()..priority = 1);
     await traceAllBodies();
-    await traceAllBodies();
   }
 }

packages/pinball_components/sandbox/lib/stories/sparky_bumper/sparky_bumper_game.dart

@@ -16,12 +16,21 @@ class SparkyBumperGame extends BasicBallGame with Traceable {
   Future<void> onLoad() async {
     await super.onLoad();
 
+    await Future.wait([
+      images.load(Assets.images.sparky.bumper.a.on.keyName),
+      images.load(Assets.images.sparky.bumper.a.off.keyName),
+      images.load(Assets.images.sparky.bumper.b.on.keyName),
+      images.load(Assets.images.sparky.bumper.b.off.keyName),
+      images.load(Assets.images.sparky.bumper.c.on.keyName),
+      images.load(Assets.images.sparky.bumper.c.off.keyName),
+    ]);
+
     final center = screenToWorld(camera.viewport.canvasSize! / 2);
     final sparkyBumperA = SparkyBumper.a()
-      ..initialPosition = Vector2(center.x - 20, center.y - 20)
+      ..initialPosition = Vector2(center.x - 20, center.y + 20)
       ..priority = 1;
     final sparkyBumperB = SparkyBumper.b()
-      ..initialPosition = Vector2(center.x - 10, center.y + 10)
+      ..initialPosition = Vector2(center.x - 10, center.y - 10)
       ..priority = 1;
     final sparkyBumperC = SparkyBumper.c()
       ..initialPosition = Vector2(center.x + 20, center.y)