Add terrain hit effects, progressive damage component, and update collectable signals

scripts/components/heal_component.gd

@@ -0,0 +1,40 @@
+class_name HealComponent
+extends Node
+
+@export var heal_fx: GPUParticles2D
+@export var collectable: CollectableComponent
+
+
+func _ready() -> void:
+	if not collectable:
+		printerr("HealComponent: No CollectableComponent assigned.")
+		return
+
+	collectable.collected.connect(on_collected)
+
+
+func on_collected(amount: float, type: CollectableResource.CollectableType, _body: Node2D) -> void:
+	if type != CollectableResource.CollectableType.HEALTH:
+		return
+
+	if not collectable:
+		printerr("HealComponent: No CollectableComponent assigned.")
+		return
+
+	var health_component := _body.get_node_or_null("HealthComponent") as HealthComponent
+	if not health_component or not health_component is HealthComponent:
+		printerr("HealComponent: No HealthComponent found on collected body.")
+		return
+	health_component.increase_health(amount)
+	if heal_fx:
+		play_heal_fx()
+	else:
+		owner.queue_free()
+
+
+func play_heal_fx() -> void:
+	if not heal_fx:
+		return
+
+	heal_fx.restart()
+	heal_fx.emitting = true