Fix [hidden] being overridden by button styles, render Google/Kakao/Naver quick login as icons, and show logout only when authenticated.
Co-authored-by: Cursor <cursoragent@cursor.com>
Show login status in header, guard manage actions behind allowed emails, and add Auth0 SPA SDK with CDN fallback.
Co-authored-by: Cursor <cursoragent@cursor.com>