refactor: 모바일 썸네일 사이즈 160px 로 축소

[msung99]

작업 내용 (Work Content)

실제 UI/UX 를 확인해보니 썸네일 비율이 160 x 160 이 눈에 더 예쁘게 들어왔다. 160 x 160 으로 수정했다.

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관련 이슈 넘버 (Related Issue Number)

9

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