listChecklists returns nested checklists and all of their items.
automations/list-trello-checklists.automation.ts
card accepts an ID, short link, or URL. Optional account defaults to the project binding.
Returns Signal<TrelloChecklist[]>. A checklist has id, boardId, cardId, name, position, and checkItems. Each item has id, name, state, position, nullable dueAt, nullable dueReminder, and nullable memberId.