refactor: changed name for spaceshipexit layer

lib/game/components/layer.dart

@@ -59,8 +59,8 @@ enum Layer {
   /// Collide only with Spaceship group elements.
   spaceship,
 
-  /// Collide only with Spaceship drop group elements.
-  spaceshipDrop,
+  /// Collide only with Spaceship exit rail group elements.
+  spaceshipExitRail,
 }
 
 /// {@template layer_mask_bits}
@@ -89,7 +89,7 @@ extension LayerMaskBits on Layer {
         return 0x0005;
       case Layer.spaceship:
         return 0x000A;
-      case Layer.spaceshipDrop:
+      case Layer.spaceshipExitRail:
         return 0x0004;
     }
   }

lib/game/components/spaceship.dart

@@ -32,7 +32,7 @@ class Spaceship extends Forge2DBlueprint {
       SpaceshipBridge()..initialPosition = position,
       SpaceshipBridgeTop()..initialPosition = position + Vector2(0, 5.5),
       SpaceshipHole(
-        onExitLayer: Layer.spaceshipDrop,
+        onExitLayer: Layer.spaceshipExitRail,
         onExitElevation: 2,
       )..initialPosition = position - Vector2(5, 4),
       SpaceshipHole()..initialPosition = position - Vector2(-5, 4),

lib/game/components/spaceship_exit_rail.dart

@@ -30,7 +30,7 @@ class SpaceshipExitRail extends Forge2DBlueprint {
         Vector2(30, 0),
         Vector2(30, 30),
       ],
-    )..layer = Layer.spaceshipDrop;
+    )..layer = Layer.spaceshipExitRail;
 
     final entrance = Pathway.arc(
       color: const Color.fromARGB(255, 226, 226, 218),
@@ -40,7 +40,7 @@ class SpaceshipExitRail extends Forge2DBlueprint {
       width: 5,
       rotation: 218 * math.pi / 180,
       singleWall: true,
-    )..layer = Layer.spaceshipDrop;
+    )..layer = Layer.spaceshipExitRail;
 
     final exit = Pathway.arc(
       color: const Color.fromARGB(255, 226, 226, 218),
@@ -50,7 +50,7 @@ class SpaceshipExitRail extends Forge2DBlueprint {
       width: 5,
       rotation: 36 * math.pi / 180,
       singleWall: true,
-    )..layer = Layer.spaceshipDrop;
+    )..layer = Layer.spaceshipExitRail;
 
     addAll([
       pathway..initialPosition = position,
@@ -69,10 +69,10 @@ class SpaceshipExitHole extends RampOpening {
   /// {@macro spaceship_exit_hole}
   SpaceshipExitHole()
       : super(
-          pathwayLayer: Layer.spaceshipDrop,
+          pathwayLayer: Layer.spaceshipExitRail,
           orientation: RampOrientation.down,
         ) {
-    layer = Layer.spaceshipDrop;
+    layer = Layer.spaceshipExitRail;
   }
 
   @override