- Fix black episode thumbnails in the Next Up / Continue Watching rows:
build the parent Thumb URL from the matched ParentThumbItemId +
ParentThumbImageTag pair, instead of pairing ParentBackdropItemId with
the thumb tag (different parent -> 404 -> black). Fixed on mobile
(ContinueWatchingPoster) and TV (TVPosterCard, TVHeroCarousel).
- Add a "Use episode images for Next Up & Continue Watching" setting
(default off = series image, matching Jellyfin), wired into the home
rows on mobile and TV.
- Add helper descriptions under the Appearance settings rows.
- swap direct i18next t imports for the useTranslation hook so the four
touched components re-render on language change
- localize the buffer seconds unit via a buffer_seconds key instead of a
literal trailing s
- reword the useAppRouter guard comment to match its real scope
