a88f201cd4
- When dragging a selected card while multiple cards are selected, the browser ghost image now shows a 'N cards' badge instead of a single card. - All selected cards in the original column are dimmed (opacity 0.45 + grayscale) during the drag so the user sees the whole set is in-flight. - Uses React state for the dragged task id; event delegation on the board columns container to avoid deep prop threading.