[ns-ui] A full-bleed route curtain modeled on a real theatrical tab (tableau/opera-drape) curtain: the rigging where a line of rings runs on the diagonal from a panel's center-meeting bottom corner up to a fixed tie-off roughly a third of the way up the wing side, so hauling it draws that corner UP AND OUT
pnpm dlx shadcn@latest add "https://registry.directory/r/nikolas-sapa/curtain-tab-diagonal.json"