fix: inline JavaScript in index.html to support GameBridgeServer

GameBridgeServer only serves the index.html file and cannot serve external
JS files. Parcel was generating a separate index.js file which caused 404s.

Changes:
- Updated transform-bigint.js to inline external JavaScript
- JavaScript is now fully embedded in index.html
- Replaces <script src=/index.js> with inline <script>
- Includes JSBI and whatwg-fetch polyfills inline
- Fixed OperationCanceledException usage (was TimeoutException)

This fixes the "ready signal" never arriving from JavaScript.

Author: rodrigo-fournier-immutable

src/Packages/Passport/Runtime/Resources/index.html

@@ -146,7 +146,7 @@ private async UniTask WaitForClientConnected(WebBrowserClient webBrowserClient)
                 var errorMsg = $"[UwbWebView] Timeout after {timeoutSeconds} seconds waiting for browser OnLoadFinish event. " +
                                $"The browser failed to load the initial URL. This may indicate a CEF initialization failure.";
                 Debug.LogError(errorMsg);
-                throw new TimeoutException(errorMsg);
+                throw new OperationCanceledException(errorMsg);
             }
 
             Debug.Log($"[UwbWebView] OnLoadFinish event received successfully");