Add skill management system with unlocker and save functionality

scripts/components/skill_unlocker_component.gd

@@ -0,0 +1,34 @@
+class_name SkillUnlockerComponent
+extends Node
+
+@export var skill_manager: SkillManager
+
+@onready var game_manager: GM = $"/root/GameManager"
+
+
+func try_unlock_skill(skill_data: SkillData) -> void:
+	if not game_manager:
+		return
+
+	if game_manager.is_skill_unlocked(skill_data.name):
+		return
+
+	if game_manager.get_coins() < skill_data.cost:
+		return
+
+	game_manager.remove_coins(skill_data.cost)
+	game_manager.unlock_skill(skill_data.name)
+	skill_manager.add_skill(skill_data)
+
+
+func _input(event: InputEvent) -> void:
+	if event.is_action_pressed("unlock_skills"):
+		var available_skills: Array[SkillData] = skill_manager.available_skills
+		var skills: Array[String]              = []
+
+		for skill in available_skills:
+			skills.append(skill.name)
+
+		game_manager.unlock_skills(skills)
+		skill_manager.apply_unlocked_skills()
+		print("Unlocked skills: ", skills)