0.9.1-alpha.71

Patch Changes

• 228ea85: feat(flip-card): a card with two faces, and a turn between them

  FlipCard paints nothing and has no recipe: what turns is two faces the caller supplied, and each is usually a Card with its own variant and radius. The front decides how big the card is and the back fills it out of flow.

  The two faces stay a half turn apart at every moment, which with a hidden backface leaves exactly one of them drawn — utils/flip.ts is that relationship, tested, including the case it exists to prevent.