The editor used the browser's built-in drag-and-drop, which never fires for
a touchscreen, flickered its drop highlight over a card's inner parts, and
lost the drag whenever a board update arrived mid-drag (the editor was
rebuilt under the pointer).
Dragging is now driven by pointer events, one path for mouse and touch: a
mouse drags as soon as it moves, a finger holds still for a moment first so
a swipe still scrolls. A floating copy of the photo follows the pointer, the
spot under it lights up, the editor auto-scrolls near its edges, and board
updates wait until the drop. Tap a photo then tap a spot still works.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>