Frontend first draft

frontend/pweb/lib/pages/2fa/error_message.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+
+class ErrorMessage extends StatelessWidget {
+  final String error;
+
+  const ErrorMessage({super.key, required this.error});
+
+  @override
+  Widget build(BuildContext context) => Text(
+    error,
+    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+      color: Theme.of(context).colorScheme.error,
+    ),
+  );
+}