Add PosterBoard: FigJam-style pan/zoom board card (v1 step 1)#666

burieberry wants to merge 4 commits into

maincardstack/boxel-catalog:mainfrom

cs-12213-posterboard-step-1-live-test-for-panzoom-board-first-boxelcardstack/boxel-catalog:cs-12213-posterboard-step-1-live-test-for-panzoom-board-first-boxelCopy head branch name to clipboard