refactor (#6)

Reviewed-on: #6

scripts/Events/LevelStateHandler.cs

@@ -0,0 +1,39 @@
+using Godot;
+using Mr.BrickAdventures.Autoloads;
+
+namespace Mr.BrickAdventures.scripts.Events;
+
+/// <summary>
+/// Handles level completion events and updates GameStateStore.
+/// </summary>
+public partial class LevelStateHandler : Node
+{
+    public override void _Ready()
+    {
+        EventBus.Instance.LevelCompleted += OnLevelCompleted;
+    }
+
+    public override void _ExitTree()
+    {
+        if (EventBus.Instance != null)
+        {
+            EventBus.Instance.LevelCompleted -= OnLevelCompleted;
+        }
+    }
+
+    private void OnLevelCompleted(int levelIndex, Node currentScene, double completionTime)
+    {
+        var store = GameStateStore.Instance;
+        if (store == null) return;
+
+        // Mark level complete and unlock next
+        store.MarkLevelComplete(levelIndex);
+
+        // Commit session data to persistent state
+        store.CommitSessionCoins();
+        store.CommitSessionSkills();
+
+        // Reset session for next level
+        store.ResetSession();
+    }
+}