fix(29): correct memo syntax in JKSessionMetronome

Remove invalid arrow function syntax from memo-wrapped named function.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

jam-ui/src/components/client/JKSessionMetronome.js

@@ -9,7 +9,7 @@ import computerIcon from '../../assets/img/instruments/icon_instrument_computer4
 const JKSessionMetronome = memo(function JKSessionMetronome({
   mixers,
   onClose
-}) => {
+}) {
   const mixerHelper = useMixersContext();
   const jamClient = useJamClient();
   const [showMenu, setShowMenu] = React.useState(false);