Root cause: AbortController signals don't properly propagate through
Service Worker fetch handlers (known Chrome/Safari bug), causing the
fetch to hang indefinitely on mobile browsers instead of timing out.
Fix: replace AbortController-based timeout in api() with Promise.race
against a simple setTimeout. Also:
- Stop all MediaStream tracks explicitly in stopScanning()
- Add 200ms yield point before API call for hardware release
- Bypass SW for API requests entirely (no caching needed for lookups)
- Bump SW cache to v11
- Add outer try/catch safety net in handleBarcode
shawn
52f801675e