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

test/features/chat/models/chat_meta_model_test.dart

@@ -0,0 +1,25 @@
+import 'package:eatvio_app/features/chat/models/chat_meta_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('ChatMetaModel', () {
+    test('создает ChatMetaModel с правильными значениями', () {
+      const model = ChatMetaModel(
+        lastPage: 5,
+      );
+
+      expect(model.lastPage, 5);
+    });
+
+    test('fromJson создает ChatMetaModel из JSON', () {
+      final json = {
+        'last_page': 5,
+      };
+
+      final model = ChatMetaModel.fromJson(json);
+
+      expect(model.lastPage, 5);
+    });
+  });
+}
+