Headless gooey-surface engine: an SVG metaball filter whose border never swells, because every working blur carries its own solved pair of alpha thresholds, plus the grab gesture that pulls a liquid finger out of any surface and whips it back on a spring. Renders one filter and hands back a controller - no UI of its own.
pnpm dlx shadcn@latest add "https://crafterui.com/r/mercury-surface.json"