Add DuplicateSpaceFailureDialog widget to display error messages when duplicating spaces fails.

lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_failure_dialog.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+
+class DuplicateSpaceFailureDialog extends StatelessWidget {
+  const DuplicateSpaceFailureDialog(this.errorMessage, {super.key});
+
+  final String errorMessage;
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: const Text('Failed to duplicate space'),
+      content: Text(errorMessage),
+      actions: [
+        TextButton(
+          onPressed: Navigator.of(context).pop,
+          child: const Text('Close'),
+        ),
+      ],
+    );
+  }
+}