Fix failing test by handling async operations properly

Wrap the widget test in runAsync() to properly handle the pending Timer created by Process.run calls in FlatpakService.loadApps(). The test now waits for async operations to complete before finishing, preventing the "Timer is still pending" error.

Co-authored-by: jwinarske <[email protected]>

Author: Copilot

test/widget_test.dart

@@ -6,8 +6,19 @@ import 'package:flutter_flatseal/models/permission.dart';
 void main() {
   group('FlatsealApp', () {
     testWidgets('App launches successfully', (WidgetTester tester) async {
-      await tester.pumpWidget(const FlatsealApp());
-      expect(find.text('Flutter Flatseal'), findsOneWidget);
+      await tester.runAsync(() async {
+        await tester.pumpWidget(const FlatsealApp());
+        expect(find.text('Flutter Flatseal'), findsOneWidget);
+        
+        // Pump a frame to trigger the post-frame callback
+        await tester.pump();
+        
+        // Allow some time for async operations to complete
+        await Future.delayed(const Duration(milliseconds: 100));
+        
+        // Pump again to process any state changes
+        await tester.pump();
+      });
     });
   });