refactor: NoticePage 성능 최적화

[minsu0707]

• 불필요한 state 업데이트 제거
• useEffect + setState 제거, useMemo로 파생 데이터 계산
• 함수 선언 위치 조정으로 재생성 방지
• Optional Chaining/Nullish Coalescing으로 조건문 간소화
• 렌더링 횟수 감소 및 코드 라인 축소

[coderabbitai]

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