- Hide size picker on mobile (desktop sm:flex only)
- Copy CSS button shows icon-only on mobile, full label on desktop
- Settings gear button with active state (bg-primary when open)
- Settings panel: added size picker section at top (lg:hidden)
- Settings panel: fixed top-14 right-0 bottom-0 (below header, not full screen)
- Click-away backdrop within body area only

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>