implemented basic settings into the backend, renamed files, fixed bugs, and added back button functionality

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

@@ -1,4 +1,4 @@
-import 'package:app/util/server.dart';
+import 'package:app/util/backend.dart';
 import 'package:flutter/material.dart';
 import 'chat.dart';
 
@@ -6,19 +6,30 @@ class Conversation with ChangeNotifier {
   int conversationID;
   String conversationLabel;
   String conversationSubLabel;
+  bool history = true;
+  // History is disabled by default. This means chats are auto-deleted once the user exits that conversation.
+  bool conversationContext = true; // The prior prompts and responses are used as additional context for the next prompt and response.
+  late bool stream = false; // Update the UI with a stream of characters as received from the server, or as one text.
   List<Chat> chats = [];
 
   Conversation(this.conversationID, this.conversationLabel, this.conversationSubLabel);
 
   Conversation.completeConversation(this.conversationID, this.conversationLabel, this.conversationSubLabel, this.chats);
 
+  void toggleHistory() => history = !history;
+
+  void toggleConversationContext() => conversationContext = !conversationContext;
+
+  void toggleStream() => stream = !stream;
+
   void add(Chat message) {
     chats.add(message);
     notifyListeners();
   }
 
   void loadChats() {
-    chats = Backend.getChatsByConversationID(conversationID);
+    Backend.loadConversation;
+    chats = Backend.loadedChats;
   }
 
   void setLabel() {