Results 2 issues of 조병우

I'm trying to put a cancel button on the progress notification. To distinguish progress notifications from other general notifications, I divided them into groups, and confirmed that the grouping works...

[Bug] ![image](https://github.com/jmjeon94/N2T/assets/26822105/c8a33505-3355-42e0-9ea9-1062343a9109) 이미지 첨부시 위 사진과 같이 이미지가 표시되지 않는 문제 [changes] - img 태그에 "srcset" attribute 추가