Add collectable types and implement level unlocking mechanics; enhance player state management

scripts/components/requirement_component.gd

@@ -0,0 +1,32 @@
+class_name RequirementComponent
+extends Node
+
+@export var requirement_type: CollectableResource.CollectableType
+@export var required_amount: int = 1
+
+var current_amount: int = 0
+signal requirement_met(requirement_type: CollectableResource.CollectableType)
+@onready var gm: GM = $"/root/GameManager"
+
+
+func _ready() -> void:
+	if not gm:
+		printerr("RequirementComponent: GameManager not found.")
+		return
+
+	var collectables: Array[CollectableComponent] = gm.get_colllectable_nodes()
+	for collectable in collectables:
+		collectable.collected.connect(on_collected)
+
+
+func on_collected(amount: int, type: CollectableResource.CollectableType) -> void:
+	print("Collected: ", amount, " of type: ", str(type))
+	if type != requirement_type:
+		return
+	add_progress(amount)
+
+
+func add_progress(amount: int = 1) -> void:
+	current_amount += amount
+	if current_amount >= required_amount:
+		requirement_met.emit(requirement_type)