GPU fireworks background with a deterministic, DOM-free physics core (rockets, peony/willow/ring/glyph shells, sparks, embers, smoke) rendered by a WebGPU engine into a wide-gamut, extended-tone-mapping canvas so bursts and comet trails burn brighter than SDR white on HDR displays, degrading silently through a WebGL2 fallback and a soft-knee SDR path everywhere else
pnpm dlx shadcn@latest add "https://fancy-ui.rama.app/r/fireworks-hdr.json"