fix(extensions): shorten verification timeout

test/extension_auth_launcher_test.dart

@@ -4,6 +4,10 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:spotiflac_android/utils/extension_auth_launcher.dart';
 
 void main() {
+  test('verification challenge expires after three minutes', () {
+    expect(extensionVerificationGrantTimeout, const Duration(minutes: 3));
+  });
+
   test('extracts the extension that raised a verification challenge', () {
     expect(
       extensionIdFromVerificationError(