Remove Nostr-related stuff

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/features/compose/components/reply-mentions.tsx

@@ -5,7 +5,6 @@ import { openModal } from 'soapbox/actions/modals';
 import { useAppDispatch, useAppSelector, useCompose, useFeatures, useOwnAccount } from 'soapbox/hooks';
 import { statusToMentionsAccountIdsArray } from 'soapbox/reducers/compose';
 import { makeGetStatus } from 'soapbox/selectors';
-import { isPubkey } from 'soapbox/utils/nostr';
 
 import type { Status as StatusEntity } from 'soapbox/types/entities';
 
@@ -56,7 +55,7 @@ const ReplyMentions: React.FC<IReplyMentions> = ({ composeId }) => {
     const username = acct.split('@')[0];
     return (
       <span className='inline-block text-primary-600 no-underline [direction:ltr] hover:text-primary-700 hover:underline dark:text-accent-blue dark:hover:text-accent-blue'>
-        @{isPubkey(username) ? username.slice(0, 8) : username}
+        @{username}
       </span>
     );
   }).toArray();