Gate Flutter app behind Telegram

lib/auth/telegram_launcher_web.dart

@@ -0,0 +1,8 @@
+import 'dart:js_interop';
+
+@JS('window.open')
+external JSAny? _open(JSString url, JSString target, JSString features);
+
+void openTelegramUrl(String url) {
+  _open(url.toJS, '_blank'.toJS, 'noopener,noreferrer'.toJS);
+}