chore: add mx-uc.css

src/app/components/message/Reaction.tsx

@@ -3,7 +3,7 @@ import { Box, Text, as } from 'folds';
 import classNames from 'classnames';
 import { MatrixClient, MatrixEvent, Room } from 'matrix-js-sdk';
 import * as css from './Reaction.css';
-import { getHexcodeForEmoji, getShortcodeFor } from '../../plugins/emoji';
+import { getHexcodeForEmoji, getShortcodeFor, getEmojiUrl, isUsingTwemoji } from '../../plugins/emoji';
 import { getMemberDisplayName } from '../../utils/room';
 import { eventWithShortcode, getMxIdLocalPart } from '../../utils/matrix';
 
@@ -31,6 +31,13 @@ export const Reaction = as<
           src={mx.mxcUrlToHttp(reaction) ?? reaction}
           alt={reaction}
         />
+      ) : isUsingTwemoji() ? (
+        <img
+          className={css.ReactionImg}
+          src={getEmojiUrl(reaction)}
+          alt={reaction}
+          title={getShortcodeFor(getHexcodeForEmoji(reaction))}
+        />
       ) : (
         <Text as="span" size="Inherit" truncate>
           {reaction}