Books with previews
Preview-first directory behavior
This lane prioritizes books marked with preview availability and stays safe if live provider calls are unavailable.
Provider-backed preview discovery is available in configured runtimes.
Provider-hosted previews only appear when linked access exists.
No embedded viewer is rendered unless linked preview access is available.
Preview-eligible titles
No embedded viewer is included in this route.
No preview-labeled books are available in the current fallback catalog.