Only the injected board checkbox UI changed. Trello now shows an edit button in the top-right corner of a card preview on hover, which covered the checkbox. The checkbox is now attached to Trello's card root element (data-card-id), vertically centered on the card's right edge, and layered above Trello's hover buttons; the whole checkbox area is clickable. Permissions, network requests, data handling, and the export flow are unchanged.