Wrapped all debug print() calls in APIService (avatar debugging),
BeaconScanner (scan/resolve logging), TaskDetailScreen (beacon state),
and AboutScreen (error logging) with IS_DEV checks so they are silent
in production builds. Preview-only prints in RatingDialog left as-is.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>