Swiping across the board to scroll horizontally was intermittent when the
gesture started on a task card. Cards render with native HTML5 `draggable`
for desktop drag-to-move, but native DnD does not function via touch — the
attribute only arms the browser's touch-drag heuristic, which non-
deterministically hijacks horizontal swipes meant to pan the board.
Disable native drag on touch-primary devices (`(hover: none) and
(pointer: coarse)`) via a new `useCoarsePointer` hook, folded into the
card's `isDraggable`. Mouse/desktop and hybrid laptops keep drag-to-move;
touch loses nothing (DnD never worked there) and panning is now reliable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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