redesign for settings page

frontend/pweb/lib/pages/roles/widgets/actions.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+
+class RolesActions extends StatelessWidget {
+  final bool canCreate;
+  final VoidCallback onCreateRole;
+  final String createLabel;
+
+  const RolesActions({
+    super.key,
+    required this.canCreate,
+    required this.onCreateRole,
+    required this.createLabel,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    if (!canCreate) return const SizedBox.shrink();
+    return Align(
+      alignment: Alignment.centerLeft,
+      child: ElevatedButton.icon(
+        onPressed: onCreateRole,
+        icon: const Icon(Icons.add),
+        label: Text(createLabel),
+      ),
+    );
+  }
+}