Use backend rescan summary in group editor

lib/screens/group_edit_screen.dart

@@ -80,39 +80,19 @@ class _GroupEditScreenState extends ConsumerState<GroupEditScreen> {
   }
 
   Future<void> _rescan() async {
-    final beforeIds = ref
-        .read(devicesProvider)
-        .data
-        .map((device) => device.groupMemberId)
-        .toSet();
-
     setState(() => _rescanning = true);
     try {
-      await ref.read(apiProvider).rescanNetwork();
-
-      var changed = false;
-      for (var attempt = 0; attempt < 6; attempt++) {
-        await Future.delayed(const Duration(seconds: 1));
+      final response = await ref.read(apiProvider).rescanNetwork();
       await ref.read(devicesProvider.notifier).load();
-        final currentIds = ref
-            .read(devicesProvider)
-            .data
-            .map((device) => device.groupMemberId)
-            .toSet();
-        if (!_sameSet(beforeIds, currentIds)) {
-          changed = true;
-          break;
-        }
-      }
+      final summary = response.data is Map
+          ? Map<String, dynamic>.from(response.data as Map)
+          : const <String, dynamic>{};
+      final message = formatRescanSummary(summary);
 
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
-          content: Text(
-            changed
-                ? 'Список устройств обновился'
-                : 'Сканирование завершилось, но новых устройств пока не видно',
-          ),
+          content: Text(message),
           duration: const Duration(seconds: 2),
         ),
       );
@@ -427,17 +407,31 @@ class _GroupEditScreenState extends ConsumerState<GroupEditScreen> {
     );
   }
 
-  bool _sameSet(Set<String> left, Set<String> right) {
-    if (left.length != right.length) {
-      return false;
+}
+
+int _summaryInt(Map<String, dynamic> summary, String key) {
+  final value = summary[key];
+  if (value is int) {
+    return value;
   }
-    for (final item in left) {
-      if (!right.contains(item)) {
-        return false;
+  return int.tryParse(value?.toString() ?? '') ?? 0;
+}
+
+String formatRescanSummary(Map<String, dynamic> summary) {
+  final found = _summaryInt(summary, 'found');
+  final added = _summaryInt(summary, 'added');
+  final updated = _summaryInt(summary, 'updated');
+  final removed = _summaryInt(summary, 'removed_offline');
+
+  if (added == 0 && updated == 0 && removed == 0 && found == 0) {
+    return 'Сканирование завершено: устройства не найдены';
   }
+
+  if (added == 0 && removed == 0) {
+    return 'Сканирование завершено: найдено $found, обновлено $updated';
   }
-    return true;
-  }
+
+  return 'Сканирование завершено: найдено $found, новых $added, обновлено $updated, убрано $removed';
 }
 
 class _ConflictBanner extends StatelessWidget {

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 {

test/test_support.dart

@@ -36,6 +36,7 @@ class FakeIgnisApi extends IgnisApi {
   Object? eventLogData;
   Object? apiKeysData;
   Object? authData;
+  Object? rescanNetworkData;
 
   Object? devicesError;
   Object? scenesError;
@@ -329,7 +330,17 @@ class FakeIgnisApi extends IgnisApi {
     if (error != null) throw error;
     return Response(
       requestOptions: RequestOptions(path: '/devices/rescan'),
-      data: <String, dynamic>{'ok': true},
+      data:
+          rescanNetworkData ??
+          <String, dynamic>{
+            'status': 'ok',
+            'found': 0,
+            'added': 0,
+            'updated': 0,
+            'removed_offline': 0,
+            'pending_removal': 0,
+            'online': 0,
+          },
     );
   }
 }