Add MainMenuUI component for game start and exit functionality; implement scene loading and browser detection

Assets/Scenes/main.unity

@@ -4016,8 +4016,7 @@ MonoBehaviour:
   coins: 0
   roundTime: 60
   maxRounds: 10
-  winScene:
-    m_Handle: 0
+  winScene: {fileID: 102900000, guid: aa0f834fdce931b899f0fe952ad0b680, type: 3}
   arenaCenter: {fileID: 537749035}
   player: {fileID: 1261447603}
 --- !u!4 &749274450

Assets/Scenes/menu.unity.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: df478f6f2bf83fa90ad24f823d620f94
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scenes/win.unity.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: aa0f834fdce931b899f0fe952ad0b680
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Systems/GameManager.cs

@@ -4,6 +4,7 @@ using Data;
 using Sirenix.Serialization;
 using UnityEngine;
 using UnityEngine.SceneManagement;
+using Object = UnityEngine.Object;
 
 namespace Systems
 {
@@ -17,7 +18,7 @@ namespace Systems
         [OdinSerialize, SerializeField] private int coins = 0;
         [OdinSerialize, SerializeField] private float roundTime = 60f;
         [OdinSerialize, SerializeField] private int maxRounds = 20;
-        [OdinSerialize, SerializeField] private Scene winScene;
+        [OdinSerialize, SerializeField] private Object winScene;
         [OdinSerialize, SerializeField] private Transform arenaCenter;
         
         [OdinSerialize, SerializeField] private Character player;

Assets/Scripts/UI/MainMenuUI.cs

@@ -0,0 +1,42 @@
+using System;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using UnityEngine.UI;
+using Object = UnityEngine.Object;
+
+namespace UI
+{
+    public class MainMenuUI : MonoBehaviour
+    {
+        [SerializeField] private Object mainScene;
+        [SerializeField] private Button exitButton;
+
+        private void OnEnable()
+        {
+            DetectIfBrowser();
+        }
+        
+        private void DetectIfBrowser()
+        {
+            if (Application.platform == RuntimePlatform.WebGLPlayer)
+            {
+                exitButton.gameObject.SetActive(false);
+            }
+        }
+
+        public void StartGame()
+        {
+            SceneManager.LoadScene(mainScene.name);
+        }
+
+        public void ExitGame()
+        {
+            if (Application.platform == RuntimePlatform.WebGLPlayer)
+            {
+                return;
+            }
+          
+            Application.Quit();
+        }
+    }
+}

Assets/Scripts/UI/MainMenuUI.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c900e12a827647ada2f645b798bfb13e
+timeCreated: 1752406688

ProjectSettings/EditorBuildSettings.asset

@@ -5,9 +5,15 @@ EditorBuildSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 2
   m_Scenes:
-  - enabled: 0
-    path: Assets/Scenes/SampleScene.unity
-    guid: 8c9cfa26abfee488c85f1582747f6a02
+  - enabled: 1
+    path: Assets/Scenes/menu.unity
+    guid: df478f6f2bf83fa90ad24f823d620f94
+  - enabled: 1
+    path: Assets/Scenes/main.unity
+    guid: 9552b637a550584c597db3ec7cc2d716
+  - enabled: 1
+    path: Assets/Scenes/win.unity
+    guid: aa0f834fdce931b899f0fe952ad0b680
   m_configObjects:
     com.unity.input.settings.actions: {fileID: -944628639613478452, guid: 2bcd2660ca9b64942af0de543d8d7100, type: 3}
   m_UseUCBPForAssetBundles: 0