Initial commit: QR Scanner Flutter app

App móvil para validar pases QR contra base-admin-web con login Cognito,
escáner en tiempo real, feedback auditivo/háptico y README completo.

test/login_response_test.dart

@@ -0,0 +1,28 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qrscanner/models/auth_session.dart';
+import 'package:qrscanner/models/login_response.dart';
+
+void main() {
+  test('LoginResponse parsea la respuesta Cognito y usa accessToken', () {
+    const json = {
+      'success': true,
+      'accessToken': 'access-token-value',
+      'refreshToken': 'refresh-token-value',
+      'idToken': 'id-token-value',
+      'tokenType': 'Bearer',
+      'expiresIn': 3600,
+      'username': 'scanner',
+      'roles': ['ROLE_SCANNER'],
+    };
+
+    final response = LoginResponse.fromJson(json);
+    final session = AuthSession.fromLoginResponse(response);
+
+    expect(response.success, isTrue);
+    expect(response.accessToken, 'access-token-value');
+    expect(response.refreshToken, 'refresh-token-value');
+    expect(response.idToken, 'id-token-value');
+    expect(session.authorizationHeader, 'Bearer access-token-value');
+    expect(session.isScanner, isTrue);
+  });
+}

test/widget_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:qrscanner/main.dart';
+
+void main() {
+  testWidgets('Login screen renders correctly', (WidgetTester tester) async {
+    await tester.pumpWidget(const MyApp());
+
+    expect(find.text('QR Scanner'), findsOneWidget);
+    expect(find.text('Iniciar sesión'), findsOneWidget);
+    expect(find.text('Usuario'), findsOneWidget);
+  });
+}