feat: wip message input

lib/src/message_input.dart

@@ -447,7 +447,9 @@ class MessageInputState extends State<MessageInput> {
                               leading: UserAvatar(
                                 user: m.user,
                               ),
-                              title: Text('${m.user.name}'),
+                              title: Text('${m.user.name}', style: TextStyle(fontWeight: FontWeight.bold),),
+                              subtitle: Text('${m.userId}'),
+                              trailing: Icon(Icons.alternate_email, color: StreamChatTheme.of(context).primaryColor,),
                               onTap: () {
                                 _mentionedUsers.add(m.user);
 
@@ -894,10 +896,6 @@ class MessageInputState extends State<MessageInput> {
                 color: Colors.white,
                 size: 16.0,
               ),
-              constraints: BoxConstraints(
-                maxWidth: 24.0,
-                maxHeight: 24.0,
-              ),
             ),
           ),
         ),