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[2가지 기능 업데이트]
(기존: 마우스& 방향키 사용 --> 변경 후: 마우스 클릭만 사용)
: 원하는 펜 클릭하여 선택한 후 우측 상단 버튼 3개 중 원하는 두께 선택 & 그리기
(현재 세 단계로 두께 구현함)