Plex sort was a bespoke chip-pill row plus a separate asc/desc chip pair, with
the key in PlexState.sort and the direction hidden in PlexFilters.sortDir. Now:
- sort is one SortState {key,dir}; sortDir is dropped from PlexFilters (and from
the facet-key destructure). The wire call still splits it into sort + sort_dir
at the server boundary, so the backend is untouched.
- The chip sort-row is replaced by the shared SortControl (select + arrow) — the
same idiom the feed and channel manager use. New lib/plexSort.ts owns the
scope-dependent vocabulary (movies add duration) + the title/asc fallback.
- PlexProvider migrates the old storage in place: a legacy bare-key plexSort
string plus the old filters.sortDir become the {key,dir} state, so an existing
sort preference survives the upgrade.
- PlexBrowse and PlexSidebar heal the stored sort against the current scope's
options, so a movie-only key (duration) left over after switching to shows
can't ask the server for an unavailable sort.
Gate green: tsc clean, eslint 0 errors, prettier clean, vitest 93.