refactor: used children param

lib/game/components/sparky_fire_zone.dart

@@ -1,10 +1,10 @@
 // ignore_for_file: avoid_renaming_method_parameters
 
+import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/material.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
-import 'package:pinball_flame/pinball_flame.dart';
 
 /// {@template sparky_fire_zone}
 /// Area positioned at the top left of the [Board] where the [Ball]
@@ -12,31 +12,26 @@ import 'package:pinball_flame/pinball_flame.dart';
 ///
 /// When a [Ball] hits [SparkyBumper]s, the bumper animates.
 /// {@endtemplate}
-class SparkyFireZone extends Forge2DBlueprint {
-  @override
-  void build(Forge2DGame gameRef) {
-    gameRef.addContactCallback(SparkyBumperBallContactCallback());
-
-    addBlueprint(SparkyComputer());
-    final sparkyTurboChargeSensor = SparkyTurboChargeSensor()
-      ..initialPosition = Vector2(-13, 49.8);
-    final sparkyAnimatronic = SparkyAnimatronic()
-      ..position = Vector2(-13.8, -58.2);
+class SparkyFireZone extends Component with HasGameRef<Forge2DGame> {
+  /// {@macro sparky_fire_zone}
+  SparkyFireZone()
+      : super(
+          children: [
+            _SparkyBumper.a()..initialPosition = Vector2(-22.9, -41.65),
+            _SparkyBumper.b()..initialPosition = Vector2(-21.25, -57.9),
+            _SparkyBumper.c()..initialPosition = Vector2(-3.3, -52.55),
+            SparkyComputer(),
+            SparkyTurboChargeSensor()..initialPosition = Vector2(-13, -49.8),
+            SparkyAnimatronic()..position = Vector2(-13.8, -58.2),
+          ],
+        );
 
-    final lowerLeftBumper = _SparkyBumper.a()
-      ..initialPosition = Vector2(-22.9, -41.65);
-    final upperLeftBumper = _SparkyBumper.b()
-      ..initialPosition = Vector2(-21.25, -57.9);
-    final rightBumper = _SparkyBumper.c()
-      ..initialPosition = Vector2(-3.3, -52.55);
-
-    addAll([
-      lowerLeftBumper,
-      upperLeftBumper,
-      rightBumper,
-      sparkyAnimatronic,
-      sparkyTurboChargeSensor,
-    ]);
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+    gameRef
+      ..addContactCallback(SparkyBumperBallContactCallback())
+      ..addContactCallback(SparkyTurboChargeSensorBallContactCallback());
   }
 }