Update example test and fix window import

Update launch_at_login example test to use LaunchAtLoginExampleApp (replace MyApp) and adjust expectations to assert app-specific UI instead of counter behavior; remove unused Material import. In multiple_window_example, hide WindowManager when importing package:flutter/src/widgets/_window.dart to avoid a symbol/name conflict with nativeapi.

Author: lijy91

examples/launch_at_login_example/test/widget_test.dart

@@ -5,26 +5,18 @@
 // gestures. You can also use WidgetTester to find child widgets in the widget
 // tree, read text, and verify that the values of widget properties are correct.
 
-import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:launch_at_login_example/main.dart';
 
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
+    await tester.pumpWidget(const LaunchAtLoginExampleApp());
 
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
+    // Verify that the app renders and shows the expected content.
+    expect(find.text('LaunchAtLogin Example'), findsOneWidget);
+    expect(find.text('Status'), findsOneWidget);
+    expect(find.text('Supported'), findsOneWidget);
   });
 }

examples/multiple_window_example/lib/main.dart

@@ -1,7 +1,7 @@
 // ignore_for_file: invalid_use_of_internal_member, implementation_imports
 
 import 'package:flutter/material.dart';
-import 'package:flutter/src/widgets/_window.dart';
+import 'package:flutter/src/widgets/_window.dart' hide WindowManager;
 import 'package:nativeapi/nativeapi.dart';
 
 void main() {