refactor: moved Background to DebugGame

lib/game/components/background.dart

@@ -1,27 +0,0 @@
-import 'package:flame/components.dart';
-import 'package:pinball/game/pinball_game.dart';
-import 'package:pinball/gen/assets.gen.dart';
-
-class Background extends Component with HasGameRef<PinballGame> {
-  static final Vector2 size = Vector2(120, 160);
-
-  Future<void> _loadSprite() async {
-    final sprite = await gameRef.loadSprite(
-      Assets.images.components.background.path,
-    );
-    final spriteComponent = SpriteComponent(
-      sprite: sprite,
-      size: size,
-      anchor: Anchor.center,
-    )..position = Vector2(0, -7.8);
-
-    await add(spriteComponent);
-  }
-
-  @override
-  Future<void> onLoad() async {
-    await super.onLoad();
-    await _loadSprite();
-    priority = -1;
-  }
-}

lib/game/pinball_game.dart

@@ -2,14 +2,15 @@
 import 'dart:async';
 import 'dart:math' as math;
 
+import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
 import 'package:flame/input.dart';
 import 'package:flame_bloc/flame_bloc.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:pinball/flame/blueprint.dart';
-import 'package:pinball/game/components/background.dart';
 import 'package:pinball/game/game.dart';
-import 'package:pinball_theme/pinball_theme.dart';
+import 'package:pinball/gen/assets.gen.dart';
+import 'package:pinball_theme/pinball_theme.dart' hide Assets;
 
 class PinballGame extends Forge2DGame
     with FlameBloc, HasKeyboardHandlerComponents {
@@ -51,8 +52,6 @@ class PinballGame extends Forge2DGame
     camera
       ..followVector2(Vector2(0, -7.8))
       ..zoom = size.y / 16;
-
-    unawaited(add(Background()));
   }
 
   void _addContactCallbacks() {
@@ -96,6 +95,26 @@ class PinballGame extends Forge2DGame
 class DebugPinballGame extends PinballGame with TapDetector {
   DebugPinballGame({required PinballTheme theme}) : super(theme: theme);
 
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+    await _loadBackground();
+  }
+
+  // TODO(alestiago): Remove once it is no longer needed.
+  Future<void> _loadBackground() async {
+    final sprite = await loadSprite(
+      Assets.images.components.background.path,
+    );
+    final spriteComponent = SpriteComponent(
+      sprite: sprite,
+      size: Vector2(120, 160),
+      anchor: Anchor.center,
+    )..position = Vector2(0, -7.8);
+
+    await add(spriteComponent);
+  }
+
   @override
   void onTapUp(TapUpInfo info) {
     addFromBlueprint(BallBlueprint(position: info.eventPosition.game));