feat: 보관함 페이지에 대한 디자인 시스템 적용

[MTtankkeo]

작업 내용

• 보관함 페이지 전반에 GDS 기반 디자인 시스템을 적용
• 저장한 글 목록을 기존 페이지네이션에서 무한 스크롤 방식으로 변경
• 보관함 진입 경로 및 상단 내비게이션 UI 정리

피그마 참고

모바일: https://www.figma.com/design/BA5LeHKF3saevi3poE85n2/Grimity_APP?node-id=1034-84339&m=dev
테블릿: https://www.figma.com/design/BA5LeHKF3saevi3poE85n2/Grimity_APP?node-id=1001-269001&m=dev

[gemini-code-assist]

Code Review

This pull request refactors the storage page and navigation components, reducing the storage tabs to two (Like Feed and Save Post) and integrating GDS design system components. It also implements infinite scrolling for saved posts and cleans up unused providers and enums. The reviewer feedback highlights a few key improvements: adding error handling to the new loadMore method in SavePostData to prevent infinite scroll failures, removing an accidental BOM character in feed_detail_page.dart, addressing a mismatch where likeCount is displayed next to the bookmark icon in GrimityUtilBar, and adding vertical padding to the saved posts list for better UI consistency.

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