Use backend rescan summary in group editor

test/forms_widget_test.dart

@@ -82,6 +82,39 @@ void main() {
     expect(api.createdGroupMacs, ['AA:BB']);
   });
 
+  testWidgets('group edit screen shows backend rescan summary', (
+    tester,
+  ) async {
+    final api = FakeIgnisApi(
+      devicesData: {
+        'devices': [
+          {'mac': 'AA:BB', 'name': 'Лампа 1'},
+        ],
+      },
+      groupsData: <Object>[],
+    )..rescanNetworkData = {
+      'status': 'ok',
+      'found': 3,
+      'added': 1,
+      'updated': 2,
+      'removed_offline': 1,
+      'pending_removal': 0,
+      'online': 3,
+    };
+
+    await pumpTestApp(tester, child: const GroupEditScreen(), api: api);
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byTooltip('Пересканировать сеть'));
+    await tester.pumpAndSettle();
+
+    expect(
+      find.text('Сканирование завершено: найдено 3, новых 1, обновлено 2, убрано 1'),
+      findsOneWidget,
+    );
+    expect(api.rescanCalls, 1);
+  });
+
   testWidgets('api keys screen validates and shows created key banner', (
     tester,
   ) async {