- tqdm hook emits progress every 0.3s with backend rate (bytes/sec)
- Frontend uses backend rate for instant speed display, no 2s warmup
- Shows 'Connecting to HuggingFace…' during connect phase
- Shows 'measuring speed…' before rate is available
- Re-check button moved to top-right header in system preflight
- Retry + Clean & Retry buttons on failed splash screen
- Smart error hints (missing README, network timeout, port in use)
- README.md + omnivoice/ source package copied during bootstrap
- desktop-prod.sh wipes HF cache + all app data for fresh testing