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

scripts/components/enemy_wave_trigger.gd

@@ -0,0 +1,37 @@
+class_name EnemyWaveTrigger
+extends Node
+
+@export var area2d: Area2D
+@export var path_follow_node: PathFollow2D
+@export var speed: float = 100.0
+@export var loop: bool = false
+@export var activate_on_enter: bool = true
+
+var active: bool = false
+
+
+func _ready() -> void:
+	area2d.body_entered.connect(_on_body_entered)
+	if path_follow_node:
+		path_follow_node.progress = 0
+		path_follow_node.set_process(false)
+
+
+func _process(delta: float) -> void:
+	if not active or not path_follow_node:
+		return
+	path_follow_node.progress += speed * delta
+	if path_follow_node.progress_ratio >= 1.0 and not loop:
+		active = false
+		path_follow_node.set_process(false)
+
+
+func _on_body_entered(body: Node2D) -> void:
+	if activate_on_enter:
+		start_wave()
+
+
+func start_wave() -> void:
+	if path_follow_node:
+		path_follow_node.set_process(true)
+		active = true