feat(plex): sort direction, genre any/all, multi-person filters; fix back-nav + player stop

UAT follow-ups on the Plex filter epic:
- Sort now has an asc/desc toggle (sort_dir), applied to any sort field.
- Genre multi-select gains an Any/All mode (genre_mode: OR vs AND containment).
- Director/actor/studio become multi-value: people AND (titles featuring all selected),
  studios OR; clicking them on the info page stacks (unions) instead of replacing, and
  the sidebar shows each as a removable 'Active' chip.
- fix(history): clicking a metadata filter on the info page now pushes a fresh grid
  entry instead of history.back(), so browser Back returns to the info page rather than
  leaving the Plex module.
- fix(player): fully tear down the <video> + hls on unmount and guard late play() calls,
  so backing out of a just-started video no longer leaves audio playing in the background.
i18n en/hu/de (match any/all, sort direction).

frontend/src/lib/releaseNotes.ts

@@ -19,10 +19,14 @@ export const RELEASE_NOTES: ReleaseEntry[] = [
     date: "2026-07-05",
     summary: "Powerful Plex filters — by genre, IMDb rating, year, length, added date and age rating — and click any detail on the info page to filter by it. Plus much faster poster loading.",
     features: [
-      "Plex library: a greatly expanded filter panel for movies — genre, IMDb rating, year range, length, when it was added to Plex, and age rating — plus new sort orders (release date, year, IMDb rating, length).",
-      "Plex info page: the year, genres, director, cast and studio are now clickable — tap one to filter the whole library by it (e.g. every film with an actor, or everything rated 7+).",
+      "Plex library: a greatly expanded filter panel for movies — genre, IMDb rating, year range, length, when it was added to Plex, and age rating — plus new sort orders (release date, year, IMDb rating, length) with an ascending/descending toggle.",
+      "Plex filters: pick several genres and choose Any (match one) or All (match every one); stack multiple actors, directors and studios at once (from the info page).",
+      "Plex info page: the year, genres, director, cast and studio are now clickable — tap one to filter the whole library by it (e.g. every film with an actor, or everything rated 7+). Browser Back returns to the info page.",
       "Plex: posters and cast photos are cached on disk after first view, so scrolling the library is much smoother on repeat visits.",
     ],
+    fixes: [
+      "Plex player: leaving a video with Back now fully stops it — no more audio playing in the background until a refresh.",
+    ],
   },
   {
     version: "0.25.0",