fix: stabilize VR UI and song playback

Assets/Script/VRPointerSetup.cs

@@ -8,16 +8,64 @@ namespace VRBeats
     // 나머지 씬: 바로 활성 상태로 추가.
     public class VRPointerSetup : MonoBehaviour
     {
-        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
+        private static VRPointerSetup instance;
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
+        private static void ResetStatics()
+        {
+            instance = null;
+        }
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
         private static void AutoInject()
         {
+            if (instance != null)
+                return;
+
             var go = new GameObject("[VRPointerSetup]");
             go.AddComponent<VRPointerSetup>();
         }
 
+        private void Awake()
+        {
+            if (instance != null && instance != this)
+            {
+                Destroy(gameObject);
+                return;
+            }
+
+            instance = this;
+            DontDestroyOnLoad(gameObject);
+        }
+
+        private void OnEnable()
+        {
+            SceneManager.sceneLoaded += OnSceneLoaded;
+        }
+
+        private void OnDisable()
+        {
+            SceneManager.sceneLoaded -= OnSceneLoaded;
+        }
+
         private void Start()
         {
-            bool isGameScene = SceneManager.GetActiveScene().name == "Game";
+            SetupActiveScene();
+        }
+
+        private void OnSceneLoaded(Scene scene, LoadSceneMode mode)
+        {
+            SetupScene(scene);
+        }
+
+        private static void SetupActiveScene()
+        {
+            SetupScene(SceneManager.GetActiveScene());
+        }
+
+        private static void SetupScene(Scene scene)
+        {
+            bool isGameScene = scene.name == "Game";
             SetupControllers(disabledByDefault: isGameScene);
         }