Plan step 36 review. interaction.css read `data-dragged` beside `data-md-dragged` while <x-card> still set the old name; the card now sets the new one and nothing in the package renders the old one on an element with the class, which 2.0.0 introduces. The Tailwind `state-layer` utility keeps `data-dragged` until step 39 deletes it. UPGRADE.md's card line named the old `data-card` hook. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9