fix(web): prevent Enter key from sending message during IME composition (#715)

Co-authored-by: Zaki Manian <zaki@iqlusion.io>

src/channels/web/static/app.js

@@ -1481,7 +1481,7 @@ chatInput.addEventListener('keydown', (e) => {
     }
   }
 
-  if (e.key === 'Enter' && !e.shiftKey) {
+  if (e.key === 'Enter' && !e.shiftKey && !e.isComposing) {
     e.preventDefault();
     hideSlashAutocomplete();
     sendMessage();