fix: restore only main macOS window and select active downloads

ui/flutter/test/features/tasks/presentation/create_task_window_page_test.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/widgets.dart';
+import 'package:flutter/services.dart';
+import 'package:desktop_multi_window/desktop_multi_window.dart';
 import 'package:flutter/widgets.dart' as flutter show Row;
 import 'package:flutter/foundation.dart' show TargetPlatform, debugDefaultTargetPlatformOverride;
 import 'package:flutter/material.dart' show Icons;
@@ -10,6 +12,7 @@ import 'package:gopeed/api/model/downloader_config.dart';
 import 'package:gopeed/api/model/options.dart';
 import 'package:gopeed/api/model/request.dart';
 import 'package:gopeed/core/capabilities/app_capabilities.dart';
+import 'package:gopeed/core/capabilities/app_navigation_capability.dart';
 import 'package:gopeed/core/capabilities/capability_rpc.dart';
 import 'package:gopeed/core/capabilities/gopeed_capability.dart';
 import 'package:gopeed/core/capabilities/storage_capability.dart';
@@ -22,6 +25,58 @@ import 'package:gopeed/shared/widgets/app_tooltip.dart';
 import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 
 void main() {
+  for (final navigationFails in [false, true]) {
+    testWidgets('child creation selects downloads before closing (navigation fails: $navigationFails)', (tester) async {
+      tester.view.physicalSize = const Size(1024, 720);
+      tester.view.devicePixelRatio = 1;
+      addTearDown(tester.view.resetPhysicalSize);
+      addTearDown(tester.view.resetDevicePixelRatio);
+      final events = <String>[];
+      const channel = MethodChannel('window_manager');
+      final messenger = TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger;
+      messenger.setMockMethodCallHandler(channel, (call) async {
+        events.add(call.method);
+        return null;
+      });
+      addTearDown(() => messenger.setMockMethodCallHandler(channel, null));
+      final config = DownloaderConfig(downloadDir: '/downloads')..extra.defaultDirectDownload = true;
+      final registry = CapabilityRegistry(createAppCapabilityCodecs())
+        ..bind(GopeedMethods.getConfig, (_) => config)
+        ..bind(StorageMethods.saveCreateHistory, (_) => const RpcUnit())
+        ..bind(GopeedMethods.createTask, (_) {
+          events.add('created');
+          return 'task-id';
+        })
+        ..bind(NavigationMethods.showDownloadingTasks, (_) {
+          events.add('downloads');
+          if (navigationFails) throw StateError('Navigation unavailable');
+          return const RpcUnit();
+        });
+      await tester.pumpWidget(
+        ProviderScope(
+          overrides: [appCapabilitiesProvider.overrideWithValue(AppCapabilities(LocalCapabilityInvoker(registry)))],
+          child: shad.ShadcnApp(
+            theme: AppTheme.light(),
+            materialTheme: AppTheme.materialLight(),
+            home: AppComponentThemes(
+              child: CreateTaskWindowPage(
+                windowController: WindowController.fromWindowId('child'),
+                initialTask: CreateTask(req: Request(url: 'https://example.com/file.apk')),
+              ),
+            ),
+          ),
+        ),
+      );
+      await tester.pumpAndSettle();
+      await tester.tap(find.text('Confirm'));
+      // The mocked native close deliberately leaves the widget mounted.
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 100));
+      expect(events, ['created', 'downloads', 'close']);
+      await tester.pumpWidget(const SizedBox());
+    });
+  }
+
   testWidgets('mobile create task page starts below the system status bar', (WidgetTester tester) async {
     debugDefaultTargetPlatformOverride = TargetPlatform.android;
     tester.view.physicalSize = const Size(700, 760);

ui/flutter/test/widget_test.dart

@@ -13,6 +13,9 @@ import 'package:go_router/go_router.dart';
 import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 import 'package:window_manager/window_manager.dart';
 import 'package:gopeed/app/app.dart';
+import 'package:gopeed/app/router/app_router.dart';
+import 'package:gopeed/core/capabilities/app_capabilities.dart';
+import 'package:gopeed/core/capabilities/app_navigation_capability.dart';
 import 'package:gopeed/app/application/app_appearance_controller.dart';
 import 'package:gopeed/app/application/app_deep_link_controller.dart';
 import 'package:gopeed/app/application/app_notification_controller.dart';
@@ -93,6 +96,38 @@ import 'package:gopeed/util/updater.dart';
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized().platformDispatcher.localeTestValue = const Locale('en');
 
+  testWidgets('child success returns to downloading from completed and another page', (tester) async {
+    await _setTestSize(tester, const Size(1024, 768));
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          appRuntimeControllerProvider.overrideWith(FakeRuntimeController.new),
+          tasksControllerProvider.overrideWith(CompletedTasksController.new),
+          settingsControllerProvider.overrideWith(FakeSettingsController.new),
+        ],
+        child: const GopeedApp(),
+      ),
+    );
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Completed'));
+    await tester.pumpAndSettle();
+    expect(find.text('done.zip'), findsOneWidget);
+
+    // Exercise the same serialized operation dispatched by a child window.
+    await LocalAppCapabilities.instance.registry.invoke(NavigationMethods.showDownloadingTasks.name, {});
+    await tester.pumpAndSettle();
+    expect(find.text('done.zip'), findsNothing);
+    expect(find.text('Create Task'), findsOneWidget);
+
+    GoRouter.of(AppRouter.rootNavigatorKey.currentContext!).go('/settings');
+    await tester.pumpAndSettle();
+    await LocalAppCapabilities.instance.capabilities.navigation.showDownloadingTasks();
+    await tester.pumpAndSettle();
+    expect(GoRouter.of(AppRouter.rootNavigatorKey.currentContext!).routeInformationProvider.value.uri.path, '/');
+    expect(find.text('done.zip'), findsNothing);
+    expect(find.text('Create Task'), findsOneWidget);
+  });
+
   test('Web MCP endpoint excludes page path, query, and hash route', () {
     expect(
       webMcpEndpoint(Uri.parse('https://gopeed.example:8443/app?source=desktop#/settings/advanced')),