Frontend first draft

frontend/pweb/lib/utils/error/content.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+
+class ErrorSnackBarContent extends StatelessWidget {
+  final String situation;
+  final String localizedError;
+
+  const ErrorSnackBarContent({
+    super.key,
+    required this.situation,
+    required this.localizedError,
+  });
+
+  @override
+  Widget build(BuildContext context) => Column(
+    mainAxisSize: MainAxisSize.min, // wrap to content
+    crossAxisAlignment: CrossAxisAlignment.start,
+    children: [
+      Text(
+        situation,
+        style: const TextStyle(fontWeight: FontWeight.bold),
+      ),
+      const SizedBox(height: 4),
+      Text(localizedError),
+    ],
+  );
+}