(WIP) Add network test

- Network tested
 - Some UI updates

shared/lib/models/message.dart

@@ -0,0 +1,29 @@
+// shared/lib/models/message.dart
+import 'dart:convert';
+
+class Message {
+  final String chatId;
+  final String msg;
+
+  Message({required this.chatId, required this.msg});
+
+  
+  Map<String, dynamic> toMap() {
+    return {
+      'chat_id': chatId,
+      'msg': msg,
+    };
+  }
+
+  
+  factory Message.fromMap(Map<String, dynamic> map) {
+    return Message(
+      chatId: map['chat_id'] ?? '',
+      msg: map['msg'] ?? '',
+    );
+  }
+
+  
+  String toJson() => json.encode(toMap());
+  factory Message.fromJson(String source) => Message.fromMap(json.decode(source));
+}