refactor: enhance GameStateStore integration and improve skill management

Autoloads/SkillManager.cs

@@ -11,7 +11,7 @@ namespace Mr.BrickAdventures.Autoloads;
 public partial class SkillManager : Node
 {
     private PlayerController _player;
-    private GameManager GameManager => GameManager.Instance;
+    private GameStateStore Store => GameStateStore.Instance;
 
     [Export] public Array<SkillData> AvailableSkills { get; set; } = [];
 
@@ -154,18 +154,14 @@ public partial class SkillManager : Node
     public void ApplyUnlockedSkills()
     {
         if (_player == null || !IsInstanceValid(_player)) return;
-        if (GameManager == null) return;
+        if (Store == null) return;
 
         foreach (var sd in AvailableSkills)
         {
-            if (GameManager.IsSkillUnlocked(sd))
-            {
+            if (Store.IsSkillUnlocked(sd))
                 CallDeferred(MethodName.AddSkill, sd);
-            }
             else
-            {
                 RemoveSkill(sd.Name);
-            }
         }
     }