added multimedia support and STT. STT and photos are have bugs but are functional. file upload is conceptualized but will require additional backend work. video is on hold for now.

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

@@ -1,5 +1,5 @@
 import 'package:app/components/conversation_thread/conversation.dart';
-import 'package:app/util/backend.dart';
+import 'package:app/components/util/backend.dart';
 import 'package:provider/provider.dart';
 
 import '/components/conversation_thread/chat_bubble_widget.dart';
@@ -50,6 +50,7 @@ class _ConversationThreadWidgetState extends State<ConversationThreadWidget> {
 
   @override
   Widget build(BuildContext context) {
+    // TODO: Add a scrollbar
       return Container(
         width: double.infinity,
         height: double.infinity,