- Accept confetti: CSS-only 4-dot burst spawned at the accepted card, trajectory via inline --dx/--dy, auto-cleared after 720ms. - Distraction-free mode: editor focus collapses the doc-list sidebar (width→0 slide), canvas re-centers full-width; Escape or a click outside the canvas (header/gutter/status bar) restores it. Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd