Stable-fluids solver (velocity + dye) stirred by mouse/touch drives a GPU
spring system over all ~65k particles: they swirl with the flow, heat up
and flare while disturbed, then spring home. The sky shader leans and
washes with the flow. WebGL2; falls back to the static orb without float
render targets, and to a CSS orb without WebGL2.
Replaces the Crush landing page with a single-screen hero (no scroll):
gradient sky, particle orb with corona, 'Welcome to dangrubb.net' title,
top-left DG logo and a numbered menu. Raw WebGL (no three.js), self-hosted
Instrument Sans + Geist Mono. ~10 KB of JS.
