학생등록/ 진급 기능 등 날짜 선택 기능이 필요한 곳에 데이트피커 적용

[GanziMan]

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• 학생등록/ 진급 기능 등 날짜 선택 기능이 필요한 곳에 데이트피커 적용

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[Copilot]

Pull Request Overview

This PR replaces custom date string handling in the attendee creation form with a dedicated date picker drawer component and refactors related UI elements.

• Removed manual date formatting logic and integrated DateDrawer with dayjs for birth and enrollment dates
• Added state and handlers to open the drawer and set form values on date selection
• Updated inputs to be read-only with click triggers, extracted relationOptions, and standardized error message wrappers

Comments suppressed due to low confidence (2)

src/pages/book/book-attendee/attendee-create/_components/Step1.tsx:56

• [nitpick] The function name handleCurrentDay is ambiguous; consider renaming it to handleBirthDateSelect to clearly indicate its purpose.

  const handleCurrentDay = useCallback(

src/pages/book/book-attendee/attendee-create/_components/Step1.tsx:306

• The new DateDrawer component integration isn't covered by existing tests; consider adding unit or integration tests to verify drawer open/close behavior and ensure selected dates update the form correctly.

      <DateDrawer