feat: add BootStatusUIView for loading progress display with text feedback

- Create new BootStatusUIView MonoBehaviour component with StatusText and ProgressSlider fields
- Implement SetStatus() and SetProgress() methods for updating UI elements
- Replace Transform-based ProgressFill in LoadingUIView with Slider component for better UX
- Integrate BootStatusUIView into LoadState with real-time status updates during loading steps
- Display formatted progress text (e.g., 'Loading 50%') alongside slider updates
- Add SceneTemplateSettings.json to ProjectSettings for scene template configuration

Assets/Scripts/Boot/UI/LoadingUIView.cs

@@ -1,12 +1,13 @@
 using QuizPleaseTest.Common.UI;
 using UniRx;
 using UnityEngine;
+using UnityEngine.UI;
 
 namespace QuizPleaseTest.Boot.UI
 {
     public class LoadingUIView : UIView<LoadingUIViewModel>
     {
-        [field: SerializeField] public Transform ProgressFill { get; private set; }
+        [field: SerializeField] public Slider ProgressSlider { get; private set; }
 
         private CompositeDisposable _disposables;
 
@@ -32,14 +33,12 @@ namespace QuizPleaseTest.Boot.UI
 
         private void SetProgress(float progress)
         {
-            if (ProgressFill == null)
+            if (ProgressSlider == null)
             {
                 return;
             }
 
-            Vector3 scale = ProgressFill.localScale;
-            scale.x = Mathf.Clamp01(progress);
-            ProgressFill.localScale = scale;
+            ProgressSlider.value = Mathf.Clamp01(progress);
         }
     }
 }