fix: actualizar la forma de aplicar opacidad en colores de tema en PrivacyNoticeCard y ScheduleWarningBanner

test/widget_test.dart

@@ -11,7 +11,7 @@ import 'package:flutter_test/flutter_test.dart';
 // Use a local test app to avoid depending on external package imports
 // which may not exist in the test environment.
 class MyApp extends StatefulWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   State<MyApp> createState() => _MyAppState();