add collecting coins

scripts/components/can_pickup.gd

@@ -0,0 +1,2 @@
+class_name CanPickUpComponent
+extends Node

scripts/components/collectable.gd

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+class_name CollectableComponent
+extends Node
+
+var root: Node
+
+@export var area2d: Area2D
+@export var collectable_data: Resource
+
+signal collected(amount: int)
+
+func _ready() -> void:
+    if area2d:
+        area2d.body_entered.connect(_on_area2d_body_entered)
+    else:
+        print("Collectable node missing Area2D child.")
+
+    root = get_parent()
+
+func _on_area2d_body_entered(body: Node2D) -> void:
+    if body.has_node("CanPickUpComponent"):
+        collected.emit(collectable_data.amount)
+        root.queue_free()

scripts/components/score.gd

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+class_name ScoreComponent
+extends Node
+
+@onready var game_manager: GM = $"/root/GameManager"
+
+func _ready():
+    await get_tree().process_frame
+    var coins = get_tree().get_nodes_in_group("coins")
+    
+    for coin in coins:
+        coin.connect("collected", on_collected)
+
+func on_collected(amount: int) -> void:
+    if not game_manager:
+        return
+
+    game_manager.add_coins(amount)
+    print("Coins: ", game_manager.get_coins())
+    # todo: play sound
+    # todo: update ui