Give TV shows the same filterable metadata as movies so the TV grid can be
filtered/sorted, not just library+sort. Backend: migration 0052 adds
rating/content_rating/studio/originally_available_at/genres/directors/cast_names/
people_text to plex_shows (+ GIN/indexes, people_text folded into search_vector);
_sync_shows populates them cheaply from the show section listing (no per-item
calls). /browse show-branch gains the movie filter set (minus duration) plus an
aggregate per-user watch-state (a show rolls up its episodes: all watched=watched,
any progress=in_progress, none=new) with year/rating/release sorts; /facets returns
show facets. Frontend: PlexSidebar renders the metadata filters + watch-state for TV
libraries (duration stays movie-only); show cards show a watched/in-progress badge.
i18n plex.inProgress (en/hu/de). Needs a Plex re-sync to populate the new columns.
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