A loader / progress surface that prints its content in the way a laser printer images a page: a top-to-bottom expose/develop wipe with toner visibly catching behind it, fine edges thinning for 400ms before filling to full density, and a persistent starvation streak on any large fill area, locked down by a single fuse-roller highlight pass. An unbounded charge/wipe/hold/reset loop, not a spinner.
npx shadcn@latest add https://design.helpmarq.com/r/toner-fuse-streak.jsontoner-fuse-streak