feat(dependencies): add rxdart package and improve string extension methods for better handling of empty strings and gender parsing

test/features/create_recipe/models/step_test.dart

@@ -0,0 +1,27 @@
+import 'package:eatvio_app/features/create_recipe/models/step.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Step', () {
+    test('создает Step с правильными значениями', () {
+      const step = Step(
+        image: 'https://example.com/image.jpg',
+        description: 'Step description',
+      );
+
+      expect(step.image, 'https://example.com/image.jpg');
+      expect(step.description, 'Step description');
+    });
+
+    test('создает Step с null значениями', () {
+      const step = Step(
+        image: null,
+        description: null,
+      );
+
+      expect(step.image, isNull);
+      expect(step.description, isNull);
+    });
+  });
+}
+