refactor: placed drop tube and fixed layers from spaceship

lib/game/components/spaceship_exit_rail.dart

@@ -5,18 +5,20 @@ import 'dart:ui';
 
 import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
-import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart' hide Assets;
 
-/// A [Blueprint] for the spaceship exit rail.
+/// {@template spaceship_exit_rail}
+/// A [Blueprint] for the spaceship drop tube.
+/// {@endtemplate}
 class SpaceshipExitRail extends Forge2DBlueprint {
+  /// {@macro spaceship_exit_rail}
+  SpaceshipExitRail({required this.position});
+
+  /// The [position] where the elements will be created
+  final Vector2 position;
+
   @override
   void build(_) {
-    final position = Vector2(
-      PinballGame.boardBounds.left + 17,
-      PinballGame.boardBounds.center.dy + 26,
-    );
-
     addAllContactCallback([
       SpaceshipExitRailEndBallContactCallback(),
     ]);

lib/game/pinball_game.dart

@@ -53,7 +53,13 @@ class PinballGame extends Forge2DGame
         ),
       ),
     );
-    unawaited(addFromBlueprint(SpaceshipExitRail()));
+    unawaited(
+      addFromBlueprint(
+        SpaceshipExitRail(
+          position: Vector2(-32.5, 28),
+        ),
+      ),
+    );
 
     // Fix camera on the center of the board.
     camera

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

@@ -92,7 +92,7 @@ class SpaceshipSaucer extends BodyComponent with InitialPosition, Layered {
 /// {@endtemplate}
 class AndroidHead extends BodyComponent with InitialPosition, Layered {
   /// {@macro spaceship_bridge}
-  AndroidHead() : super(priority: 3) {
+  AndroidHead() : super(priority: 4) {
     layer = Layer.spaceship;
   }