Firefly Cat (1 prompt version)

A swarm of fireflies forms the shape of a cat above a midnight voxel-forest island. Every firefly is a genuine dynamic light that pools warm glow on the leaves below, flickers as it breathes, and scatters when you stir the swarm with cursor or finger. Let go and the cat always re-forms. A custom many-light Three.js shader, pure static web, no build.