(WIP) Add network test

- Network tested
 - Some UI updates

client/lib/networkManager.dart

@@ -0,0 +1,34 @@
+import 'package:http/http.dart' as http;
+import 'package:shared/models/message.dart';
+
+class NetworkManager {
+  final String baseUrl = "https://msg.mr-potato.ru";
+
+  Future<void> send(Message message) async {
+    final url = Uri.parse('$baseUrl/send');
+
+    print('Отправка запроса на $url...');
+
+    try {
+      
+      final response = await http.post(
+        url,
+        headers: {
+          'Content-Type': 'application/json', 
+        },
+        body: message.toJson(), 
+      );
+
+      
+      if (response.statusCode == 200) {
+        print('Сообщение успешно доставлено!');
+        print('Ответ сервера: ${response.body}');
+      } else {
+        print('Ошибка сервера. Код: ${response.statusCode}');
+      }
+    } catch (e) {
+      
+      print('Ошибка сети: $e');
+    }
+  }
+}