[Feature] Main페이지 디자인, 에러 핸들링

[jiseung-kang]

✏️ Summary

• 스타일 수정
• 메인 페이지 추가
• 에러 핸들링

📮 Describe Your Changes

• 헤더 fixed로 전환
• 아이콘 stroke 두껍게
• 폰트 굵기 조정
• 버스 카드 간격 조정
• 페이지별 에러 핸들링

📭 Issue Number and Link

Close #141

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