Add spaceship exit component, enemy wave trigger, and update various scene properties

scripts/components/spaceship_exit_component.gd

@@ -0,0 +1,21 @@
+class_name SpaceshipExitComponent
+extends Node
+
+@export var area2d: Area2D
+signal spaceship_exited
+
+
+func _ready() -> void:
+	if not area2d:
+		printerr("SpaceshipExitComponent: area2d is not set.")
+		return
+
+	area2d.body_entered.connect(_on_area2d_body_entered)
+
+
+func _on_area2d_body_entered(body: Node2D) -> void:
+	if not body is PlayerController:
+		printerr("SpaceshipExitComponent: body is not a PlayerController.")
+		return
+	print("SpaceshipExitComponent: PlayerController exited spaceship.")
+	spaceship_exited.emit()