Implement automatic next-episode playback with a 5-second on-screen countdown, cancellation, and series-order lookup that works across season boundaries. Update the loading UI and VR pointer targeting to support the countdown flow, adjust shell/login presentation, and add autoplay coverage to tests and CI.
Show a dedicated loading spinner while playback is preparing, seeking, or buffering. This exposes buffering state from the Android and mpv backends, wires the indicator into the VR player UI, updates playback flow to keep it visible even when controls are hidden, and adds coverage for the new loading-state behavior.
Lizzy