feat(fe): create course management qna

[seoeun9]

Description

course q&a management 쪽 디자인 반영입니다.
https://www.figma.com/design/c7RefqPCB4HC9DuFhT7eFg/%EC%BD%94%EB%93%9C%EB%8B%B9-%EB%A6%AC%EB%94%94%EC%9E%90%EC%9D%B8--2025ver-?node-id=30323-23544&m=dev

Additional context

---

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines
• Read the Contributing Guidelines and follow the Commit Convention
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

closes TAS-2639

[skkuding-bot]

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[egg-zz]

고생하셨습니다!
저도 개인적으로 delete 버튼 파란색이 더 이쁘네요
management sidebar 부분에서 Q&A에 해당에는 icon은 아직 없는 건가요? Exercise랑 동일한 icon이라 여쭤봅니다!

[skkuding-bot]

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[dayeoni]

제목에 보이는 lock 이미지가 private 설정시 표시되는 아이콘인가요? 잘 몰라서 여쭤봅니다!
만약 맞다면 private 버튼을 없앴으니, 제목에 lock아이콘도 삭제해도 괜찮지않나..생각합니다
delete 버튼 파란색으로 바꾼것도 이쁜거 같아용~~

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[seoeun9]

@dayeoni @egg-zz
사이드바 디자인 변경으로 늦어졌다가 이제 완료했습니다!!
자물쇠 아이콘은 사용자가 비밀글로 설정한 질문에 보여집니다! 관리자가 비밀글 여부를 바꿀 수는 없지만 질문 생성 시에는 설정 가능합니다 :)

svg 파일은 svgr 작업 영향으로 바꿨습니다~
리뷰 부탁드려요 🥹

[dayeoni]

확인했습니다!! 고생하셨어용~~따봉!👍

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 70.2%, saving 511.7 KB.

Filename	Before	After	Improvement	Visual comparison
apps/frontend/public/banners/mainpage_middle_banner.png	729.5 KB	217.7 KB	70.2%	View diff

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