🎨 Palette: 빈 디렉토리 아이콘 개선

[seonghobae]

💡 1. 무엇을: 빈 디렉토리에 대해 📂 (열린 폴더) 아이콘을 적용하도록 수정했습니다.
🎯 2. 왜: 사용자에게 해당 폴더가 비어 있음을 직관적으로 알려 불필요한 클릭을 방지하기 위함입니다.
♿ 3. 접근성: 변경 사항 없음

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PR created automatically by Jules for task 4378678721533718387 started by @seonghobae

[google-labs-jules]

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