fix: report group control failures

lib/screens/remote_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../app/error_message.dart';
 import '../providers/providers.dart';
 import '../widgets/group_card.dart';
 import 'homes_screen.dart';
@@ -191,8 +192,7 @@ class _RemoteScreenState extends ConsumerState<RemoteScreen> {
                       ),
                       child: const Icon(Icons.delete, color: Colors.redAccent),
                     ),
-                    confirmDismiss: (_) => _confirmDeleteGroup(context, g),
-                    onDismissed: (_) => _deleteGroup(g['id'].toString()),
+                    confirmDismiss: (_) => _confirmAndDeleteGroup(context, g),
                     child: GroupCard(group: g),
                   );
                 },
@@ -201,12 +201,13 @@ class _RemoteScreenState extends ConsumerState<RemoteScreen> {
     );
   }
 
-  /// Подтверждение удаления группы свайпом
-  Future<bool> _confirmDeleteGroup(
+  Future<bool> _confirmAndDeleteGroup(
     BuildContext context,
     Map<String, dynamic> g,
   ) async {
-    return await showDialog<bool>(
+    final messenger = ScaffoldMessenger.of(context);
+    final confirmed =
+        await showDialog<bool>(
           context: context,
           builder: (ctx) => AlertDialog(
             title: const Text('Удалить группу?'),
@@ -227,18 +228,20 @@ class _RemoteScreenState extends ConsumerState<RemoteScreen> {
           ),
         ) ??
         false;
-  }
 
-  Future<void> _deleteGroup(String id) async {
+    if (!confirmed) return false;
+
     try {
-      await ref.read(apiProvider).deleteGroup(id);
+      await ref.read(apiProvider).deleteGroup(g['id'].toString());
       await ref.read(groupsProvider.notifier).refresh();
+      return true;
     } catch (e) {
       if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('Ошибка удаления: $e')));
+        messenger.showSnackBar(
+          SnackBar(content: Text('Ошибка удаления: ${describeLoadError(e)}')),
+        );
       }
+      return false;
     }
   }
 }