feat: close game fade

Assets/Plugins/FMOD/platforms/win/lib/x86_64/fmodstudioL.dll.meta

@@ -27,7 +27,7 @@ PluginImporter:
   - first:
       Standalone: Win64
     second:
-      enabled: 1
+      enabled: 0
       settings: {}
   userData: 
   assetBundleName: 

Assets/Scripts/View/DisplaySetup.cs

@@ -10,6 +10,7 @@ namespace View {
 			AppWindowUtility.AlwaysOnTop = true;
 			AppWindowUtility.FrameVisibility = false;
 			AppWindowUtility.Transparent = true;
+			AppWindowUtility.SetWindowOpacity(0xFF);
 
 			Vector2Int displaySize = new(Screen.currentResolution.width, Screen.currentResolution.height);
 			const float aspect = 10f / 15f;

Assets/Scripts/View/UI/CloseButton.cs

@@ -1,3 +1,9 @@
+using DG.Tweening;
+using DG.Tweening.Core;
+using DG.Tweening.Plugins.Options;
+using FMOD.Studio;
+using FMODUnity;
+using SatorImaging.AppWindowUtility;
 using UnityEngine;
 using UnityEngine.UI;
 
@@ -5,16 +11,47 @@ namespace View.UI {
 	public class CloseButton : MonoBehaviour {
 		private Button _button;
 
+#if !UNITY_EDITOR
+		private float _volume = 1f;
+		private float _opacity = 1f;
+		private Bus _musicBus;
+		private Bus _sfxBus;
+#endif
+
 		private void Start() {
 			_button = GetComponent<Button>();
 			_button.onClick.AddListener(CloseClicked);
+
+#if !UNITY_EDITOR
+			_musicBus = RuntimeManager.GetBus("bus:/Music");
+			_sfxBus = RuntimeManager.GetBus("bus:/SFX");
+#endif
 		}
 
 		private void CloseClicked() {
 #if UNITY_EDITOR
 			Debug.Log("Quit");
+#else
+			DOTween.To(GetOpacity, SetOpacity, 0f, 1f).onComplete += Application.Quit;
+			DOTween.To(GetVolume, SetVolume, 0f, 1f);
+#endif
+		}
+
+#if !UNITY_EDITOR
+		private float GetVolume() => _volume;
+		private void SetVolume(float volume) {
+			_volume = volume;
+			_musicBus.setVolume(volume);
+			_sfxBus.setVolume(volume);
+		}
+
+		private float GetOpacity() => _opacity;
+		private void SetOpacity(float opacity) {
+			_opacity = opacity;
+
+			byte op = (byte)(int)(opacity * 255);
+			AppWindowUtility.SetWindowOpacity(op);
+		}
 #endif
-			Application.Quit();
-		}
 	}
 }