refactor: enhance GameStateStore integration and improve skill management

scripts/Events/StatisticsEventHandler.cs

@@ -1,19 +1,16 @@
 using Godot;
 using Mr.BrickAdventures.Autoloads;
+using Mr.BrickAdventures.scripts.State;
 
 namespace Mr.BrickAdventures.scripts.Events;
 
 /// <summary>
 /// Handles game events and updates statistics accordingly.
-/// Listens to EventBus signals and increments relevant stats.
 /// </summary>
 public partial class StatisticsEventHandler : Node
 {
-    private StatisticsManager StatisticsManager => StatisticsManager.Instance;
-
     public override void _Ready()
     {
-        // Subscribe to events
         EventBus.Instance.CoinCollected += OnCoinCollected;
         EventBus.Instance.EnemyDefeated += OnEnemyDefeated;
         EventBus.Instance.PlayerDied += OnPlayerDied;
@@ -33,27 +30,17 @@ public partial class StatisticsEventHandler : Node
     }
 
     private void OnCoinCollected(int amount, Vector2 position)
-    {
-        StatisticsManager.IncrementStat("coins_collected", amount);
-    }
+        => GameStateStore.Instance?.IncrementStat(StatNames.CoinsCollected, amount);
 
     private void OnEnemyDefeated(Node enemy, Vector2 position)
-    {
-        StatisticsManager.IncrementStat("enemies_defeated");
-    }
+        => GameStateStore.Instance?.IncrementStat(StatNames.EnemiesDefeated);
 
     private void OnPlayerDied(Vector2 position)
-    {
-        StatisticsManager.IncrementStat("deaths");
-    }
+        => GameStateStore.Instance?.IncrementStat(StatNames.Deaths);
 
     private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
-    {
-        StatisticsManager.IncrementStat("levels_completed");
-    }
+        => GameStateStore.Instance?.IncrementStat(StatNames.LevelsCompleted);
 
     private void OnChildRescued(Vector2 position)
-    {
-        StatisticsManager.IncrementStat("children_rescued");
-    }
+        => GameStateStore.Instance?.IncrementStat(StatNames.ChildrenRescued);
 }