dynamic chat bubbles implemented along with conversation support. currently only hard-coded dummy data.

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

@@ -1,7 +1,3 @@
-import 'dart:convert';
-import 'package:json_annotation/json_annotation.dart';
-
-@JsonSerializable()
 class Chat {
   final String content;
   final bool role;
@@ -9,14 +5,5 @@ class Chat {
   // Most basic chat, text from server or from user.
   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.
 }