enabled togglable chat history (during runtime) that uses different api endpoints.

mobile/app/lib/components/conversation_thread/chat.dart

@@ -1,9 +1,22 @@
+import 'dart:convert';
+import 'package:json_annotation/json_annotation.dart';
+
+@JsonSerializable()
 class Chat {
-  late String message;
-  late bool isMe;
+  final String content;
+  final bool role;
 
   // Most basic chat, text from server or from user.
-  Chat(this.message, this.isMe);
+  Chat(this.content, this.role);
+
+  String toJson() {
+    Map<String, dynamic> c = {
+      "content": content,
+      "role": role,
+    };
+
+    return json.encode(c);
+  }
 
   // TODO: Overload constructors to allow for multimedia.
 }