feat: add GameBridgeServer support for macOS

Expand GameBridgeServer to include macOS builds to enable viem/Fetch API compatibility.

Changes:
- GameBridgeServer.cs: Add UNITY_STANDALONE_OSX to compilation directives
- GreeBrowserClient.cs: Use GameBridgeServer on macOS instead of file:// URLs
- IWebBrowserClient.cs: Include macOS in Dispose() interface requirement
- Passport.cs: Call Dispose() for macOS to cleanup GameBridgeServer

Background:
- viem (used in ts-immutable-sdk 2.12.4+) requires Fetch API
- file:// URLs have CORS/Fetch API restrictions
- GameBridgeServer serves via http://localhost:51990/ to provide proper origin
- Windows already uses this approach (PR #646)
- macOS now needs same solution for viem compatibility

This resolves the "App stuck in Initialisation" issue on macOS.

Author: rodrigo-fournier-immutable

src/Packages/Passport/Runtime/Scripts/Public/Passport.cs

@@ -675,8 +675,8 @@ private void OnPlayModeStateChanged(PlayModeStateChange state)
         /// </summary>
         private void DisposeAll()
         {
-            // Dispose of the web browser client for Windows only
-#if UNITY_STANDALONE_WIN || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
+            // Dispose of the web browser client for Windows and macOS (GameBridgeServer cleanup)
+#if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
             if (_webBrowserClient != null)
             {
                 _webBrowserClient.Dispose();

src/Packages/Passport/Runtime/ThirdParty/Gree/Assets/Plugins/GreeBrowserClient.cs

@@ -15,6 +15,10 @@ public class GreeBrowserClient : IWebBrowserClient
         public event OnUnityPostMessageDelegate OnAuthPostMessage;
         public event OnUnityPostMessageErrorDelegate OnPostMessageError;
 
+#if UNITY_STANDALONE_OSX
+        private GameBridgeServer? gameBridgeServer;
+#endif
+
         public GreeBrowserClient()
         {
 #if (UNITY_ANDROID && UNITY_EDITOR_OSX) || (UNITY_IPHONE && UNITY_EDITOR_OSX)
@@ -35,7 +39,20 @@ public GreeBrowserClient()
                 log: InvokeOnLogMessage
             );
 
-            webViewObject.LoadURL(GameBridge.GetFilePath());
+#if UNITY_STANDALONE_OSX
+            // Use GameBridgeServer to serve index.html via http://localhost
+            // This provides proper origin for viem/Fetch API compatibility
+            PassportLogger.Info($"{TAG} Starting GameBridgeServer for macOS...");
+            gameBridgeServer = new GameBridgeServer(GameBridge.GetFileSystemPath());
+            string serverUrl = gameBridgeServer.Start();
+            PassportLogger.Info($"{TAG} Loading URL: {serverUrl}");
+            webViewObject.LoadURL(serverUrl);
+#else
+            // Android, iOS, WebGL use file:// URLs
+            string fileUrl = GameBridge.GetFilePath();
+            PassportLogger.Info($"{TAG} Loading file URL: {fileUrl}");
+            webViewObject.LoadURL(fileUrl);
+#endif
         }
 
         private void InvokeOnPostMessageError(string id, string message)
@@ -89,6 +106,15 @@ public void ClearStorage()
         }
 #endif
 
+#if UNITY_STANDALONE_OSX
+        public void Dispose()
+        {
+            PassportLogger.Info($"{TAG} Disposing GreeBrowserClient...");
+            gameBridgeServer?.Dispose();
+            gameBridgeServer = null;
+        }
+#endif
+
     }
 }
 

src/Packages/Passport/Runtime/ThirdParty/ImmutableBrowserCore/GameBridgeServer.cs

@@ -1,4 +1,4 @@
-#if UNITY_STANDALONE_WIN || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
+#if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
 
 using System;
 using System.IO;

src/Packages/Passport/Runtime/ThirdParty/ImmutableBrowserCore/IWebBrowserClient.cs

@@ -12,8 +12,8 @@ public interface IWebBrowserClient
         void ExecuteJs(string js);
         void LaunchAuthURL(string url, string redirectUri);
 
-        // Required for Windows browser only
-#if UNITY_STANDALONE_WIN || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
+        // Required for Windows and macOS browsers (GameBridgeServer cleanup)
+#if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || (UNITY_ANDROID && UNITY_EDITOR_WIN) || (UNITY_IPHONE && UNITY_EDITOR_WIN)
         void Dispose();
 #endif