Card Rect Morph to Grid

Overview

Lerp the hero card's x/y/w/h into a grid slot. Then pop the remaining cells.

Build

1. 01

   Hero card holds.

2. 02

   Lerp rect hero → slot.

3. 03

   Stagger-pop the other cells.

card { x,y,w,h = lerp(fromRect, toRect, ease) }