Add desktop settings integration test

integration_test/desktop_settings_flow_test.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:xworkmate/main.dart' as app;
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('desktop settings exposes account and archived task panels', (
+    tester,
+  ) async {
+    tester.view.devicePixelRatio = 1;
+    tester.view.physicalSize = const Size(1440, 960);
+    addTearDown(tester.view.resetDevicePixelRatio);
+    addTearDown(tester.view.resetPhysicalSize);
+
+    await app.main();
+    await tester.pumpAndSettle(const Duration(seconds: 2));
+
+    await tester.tap(
+      find.byKey(const ValueKey<String>('sidebar-footer-settings')),
+    );
+    await tester.pumpAndSettle();
+
+    expect(
+      find.byKey(const ValueKey<String>('settings-account-panel-card')),
+      findsOneWidget,
+    );
+    expect(
+      find.byKey(const ValueKey<String>('settings-tab-selector')),
+      findsOneWidget,
+    );
+    expect(find.byKey(const Key('mobile-settings-page')), findsNothing);
+
+    await tester.tap(find.text('归档任务'));
+    await tester.pumpAndSettle();
+
+    expect(
+      find.byKey(const ValueKey<String>('settings-archived-tasks-panel-card')),
+      findsOneWidget,
+    );
+    expect(
+      find.byKey(const ValueKey<String>('settings-archived-tasks-panel')),
+      findsOneWidget,
+    );
+
+    await tester.tap(find.text('集成'));
+    await tester.pumpAndSettle();
+
+    expect(
+      find.byKey(const ValueKey<String>('settings-account-panel-card')),
+      findsOneWidget,
+    );
+  });
+}