test(app): cover routing and secure socks migrations

Cover legacy Auto and ASS preference migration, authenticated SOCKS session generation and the stock-runtime Xray SOCKS schema so future runtime changes cannot silently restore the old fixed-port/no-auth behavior.

test/no_ass_migration_test.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:revoltvpn/logic/connection_settings.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('legacy ASS migrates to SOCKS5 selected-only without losing packages', () async {
+    SharedPreferences.setMockInitialValues(<String, Object>{
+      'connection_mode': 'ass',
+      'app_routing_mode': 'selected',
+      'app_routing_packages': <String>[
+        'com.android.chrome',
+        'com.discord',
+      ],
+    });
+
+    await ConnectionSettings.initialize();
+
+    expect(ConnectionSettings.mode, ConnectionMode.proxy);
+    expect(ConnectionSettings.routingMode, AppRoutingMode.selected);
+    expect(
+      ConnectionSettings.appPackages,
+      <String>['com.android.chrome', 'com.discord'],
+    );
+  });
+}