Fix up-next episode selection for season progression

[Copilot]

The dashboard “up next” list was effectively using the first unwatched episode in release order, even when a user had already progressed into a later season. That caused older-season episodes to appear ahead of the actual continuation point, and in some cases surfaced a stale final episode even when there was no later released episode to watch.

• Problem

  • “Up next” could jump back to an earlier season instead of the next episode after the user’s last watched entry.
  • When the user was at the end of the released sequence, the queue could still suggest a final unwatched episode that was no longer the true “next” step.

• What changed

  • Updated the next-episode selector to follow the user’s latest watched episode in season/episode order instead of selecting the earliest unseen episode in the release list.
  • Preserved the existing “first released episode” behavior when the user has not watched anything yet.
  • Applied the same season-aware selection logic to bulk per-show lookups used by the dashboard and history feeds.

• Impact

  • “Up next” now reflects the user’s actual current progression through the show.
  • Earlier unwatched episodes no longer override a valid continuation in a later season.
  • Shows at the end of available releases no longer advertise a stale finale as the next episode.

• Fixes Up next show next episode #97