The polar layout of a hand-played disc as pure maths: a centre pad plus rings of wedge zones, with the same table driving the SVG paths, the hit test and the off-centre reading a press returns. No React, no DOM — so the ink and the touch targets cannot drift apart, and the whole thing is testable in Node.
pnpm dlx shadcn@latest add "https://pluginui.com/r/core-radial-pad-geometry.json"No files included in this item.