Auto Height

Animates a container’s height as its content changes, so a panel that grows or shrinks morphs instead of snapping. Built for multi-step dialogs, where the faces were already cross-dissolving but the box around them jumped. Uses the disclosure transition pair, and respects reduced motion.

Zero measurements are ignored on purpose: under AnimatePresence mode="wait" the box is genuinely empty between faces, and honouring that would collapse the panel to nothing and re-expand.