feat(task-0004): add ViewModel layer and improve UIView initialization safety

- Create SplashUIViewModel, MenuUIViewModel and LoadingUIViewModel classes implementing IUIViewModel
- Convert UI views to use generic UIView<TVm> pattern for strong typing
- Bind ViewModels in state EnterAsync methods before view initialization
- Add null check validation in UIView.Bind method with ArgumentNullException
- Track initialization state with _isInitialized flag to prevent duplicate Initialize/Release calls

Выполнена задача TASK-0004 и добавлен слой ViewModel:
- Созданы классы SplashUIViewModel, MenuUIViewModel и LoadingUIViewModel с реализацией IUIViewModel
- Преобразованы UI представления для использования общего паттерна UIView<TVm>
- Добавлено связывание ViewModels в методах EnterAsync состояний перед инициализацией вида
- Добавлена проверка на null в методе Bind с выбросом ArgumentNullException
- Добавлен флаг _isInitialized для предотвращения повторных вызовов Initialize/Release

Assets/Scripts/Boot/States/LoadState.cs

@@ -16,6 +16,7 @@ namespace QuizPleaseTest.Boot.States
 
         public UniTask EnterAsync(CancellationToken ct)
         {
+            _view.Bind(new LoadingUIViewModel());
             _view.Initialize();
             return UniTask.CompletedTask;
         }

Assets/Scripts/Boot/States/MenuState.cs

@@ -19,6 +19,7 @@ namespace QuizPleaseTest.Boot.States
 
         public async UniTask EnterAsync(CancellationToken ct)
         {
+            _view.Bind(new MenuUIViewModel());
             _view.Initialize();
             await _restartSignal.WaitAsync(ct);
         }

Assets/Scripts/Boot/States/SplashState.cs

@@ -16,6 +16,7 @@ namespace QuizPleaseTest.Boot.States
 
         public UniTask EnterAsync(CancellationToken ct)
         {
+            _view.Bind(new SplashUIViewModel());
             _view.Initialize();
             return UniTask.CompletedTask;
         }

Assets/Scripts/Boot/UI/LoadingUIView.cs

@@ -2,7 +2,7 @@ using QuizPleaseTest.Common.UI;
 
 namespace QuizPleaseTest.Boot.UI
 {
-    public class LoadingUIView : UIView
+    public class LoadingUIView : UIView<LoadingUIViewModel>
     {
     }
 }

Assets/Scripts/Boot/UI/LoadingUIViewModel.cs

@@ -0,0 +1,8 @@
+using QuizPleaseTest.Common.UI;
+
+namespace QuizPleaseTest.Boot.UI
+{
+    public class LoadingUIViewModel : IUIViewModel
+    {
+    }
+}

Assets/Scripts/Boot/UI/LoadingUIViewModel.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Boot/UI/MenuUIView.cs

@@ -2,7 +2,7 @@ using QuizPleaseTest.Common.UI;
 
 namespace QuizPleaseTest.Boot.UI
 {
-    public class MenuUIView : UIView
+    public class MenuUIView : UIView<MenuUIViewModel>
     {
     }
 }

Assets/Scripts/Boot/UI/MenuUIViewModel.cs

@@ -0,0 +1,8 @@
+using QuizPleaseTest.Common.UI;
+
+namespace QuizPleaseTest.Boot.UI
+{
+    public class MenuUIViewModel : IUIViewModel
+    {
+    }
+}

Assets/Scripts/Boot/UI/MenuUIViewModel.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Boot/UI/SplashUIView.cs

@@ -2,7 +2,7 @@ using QuizPleaseTest.Common.UI;
 
 namespace QuizPleaseTest.Boot.UI
 {
-    public class SplashUIView : UIView
+    public class SplashUIView : UIView<SplashUIViewModel>
     {
     }
 }

Assets/Scripts/Boot/UI/SplashUIViewModel.cs

@@ -0,0 +1,8 @@
+using QuizPleaseTest.Common.UI;
+
+namespace QuizPleaseTest.Boot.UI
+{
+    public class SplashUIViewModel : IUIViewModel
+    {
+    }
+}

Assets/Scripts/Boot/UI/SplashUIViewModel.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Common/UI/UIView.Generic.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace QuizPleaseTest.Common.UI
 {
     public class UIView<TVm> : UIView where TVm : IUIViewModel
@@ -6,6 +8,11 @@ namespace QuizPleaseTest.Common.UI
 
         public virtual void Bind(TVm viewModel)
         {
+            if (viewModel == null)
+            {
+                throw new ArgumentNullException(nameof(viewModel));
+            }
+
             ViewModel = viewModel;
         }
 

Assets/Scripts/Common/UI/UIView.cs

@@ -4,13 +4,27 @@ namespace QuizPleaseTest.Common.UI
 {
     public class UIView : MonoBehaviour
     {
+        private bool _isInitialized;
+
         public virtual void Initialize()
         {
+            if (_isInitialized)
+            {
+                return;
+            }
+
+            _isInitialized = true;
             gameObject.SetActive(true);
         }
 
         public virtual void Release()
         {
+            if (!_isInitialized)
+            {
+                return;
+            }
+
+            _isInitialized = false;
             gameObject.SetActive(false);
         }
     }