This change tightens the autoplay logic around favorites by validating the requested favorite number before trying to play it, which avoids invalid index handling when -a is used. It also stops deleting ziptuner.fav during the favorites flow, so saved state is retained more consistently across stop/rerun behavior, and removes an unnecessary cleanup of ziptuner.item when returning from favorites. There are also minor housekeeping updates like a user-agent version bump and debug guard cleanup. In practice, autoplay from favorites should behave more reliably and keep the expected station state intact.