fix: replace laptop with spinning cube, fix update-ready reload from worker
- Swap wireframe laptop animation for a small spinning cube in prompt
- Use send({ type: "window:reload" }) instead of location.reload() since
prompt.mjs runs in a worker where location.reload() is unavailable
- Add window:reload handler in bios.mjs
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>