The unit specs dispatch `animationend` on the dot span by hand, so a fill
whose real event no longer reached the handler would still pass. The new
Electron spec shortens `--hero-rotation-ms` and checks that the running
`::before` fill advances the slide, that pause holds it and that Play
resumes it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>