- Change desktop .column min-width from 260px to 0, letting the grid control sizing
- Add overflow-x: hidden to .column-body to prevent content blowout
- Use fixed width: 280px for mobile columns instead of min-width
- Add column-fixed-width tests verifying CSS constraints for desktop and mobile
- Change scroll-snap-align from start to center on columns (desktop and mobile)
- Add scroll-snap-type: x proximity and scroll-padding-inline on desktop .board
- Add scroll-padding-inline: calc(50% - 140px) in mobile media query
- Restructure scroll-snap tests into desktop and mobile describe blocks
- Update all test assertions to expect center alignment instead of start
- Delete public/index.html, public/style.css, and public/board.js legacy assets
- Remove public/ fallback from server.ts clientDir resolution chain
- Simplify clientDir to fall through to client/ instead of public/
- Add no-legacy-public test asserting public/ files and server references are gone
- Add scroll-snap-type: x mandatory to .board in ≤768px media query
- Set scroll-snap-align: start and flex-shrink: 0 on .column for swipe navigation
- Enable -webkit-overflow-scrolling: touch for smooth iOS scrolling
- Add mobile-scroll-snap test suite asserting snap rules inside @media block
