fix(i18n): numbers, units, dates and order in the UI language, and after a switch (E30 S3)

Every locale formatter takes the language as an argument. Under the React
Compiler a formatter that read the i18n singleton was memoized on its other
arguments, so a card kept "2 hr 4 min" after a switch to Hungarian; plexLang()
had the same flaw and left Plex queries in the old language. Components now
take the language from useTranslation, and the signature makes forgetting it
a type error.

- ratings, file sizes, stream stats: the language's decimal mark ("8,3")
- view and subscriber counts compact in the language ("1,2 E")
- seconds as the language's unit ("6 mp") in the sliders and the stats
- a person's birth and death dates as dates, not ISO strings
- A-Z lists by the shown name in the language's alphabet (compareText),
  the tag catalog re-sorted by its translated names
- lint local/locale-format (was date-format) also refuses Intl.NumberFormat
  outside lib/format.ts, localeCompare, and a component reading the language
  off the i18n singleton

frontend/src/components/PlexBrowse.tsx

@@ -93,7 +93,7 @@ const BACKABLE_VIEWS: readonly string[] = [
 ];
 
 export default function PlexBrowse() {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
   const qc = useQueryClient();
   // Scope / watch-state / sort / filters live in PlexProvider (edited mainly from PlexSidebar); the
   // search term (q) comes from the shared header box; the rail hands off a playlist to open via the
@@ -103,7 +103,7 @@ export default function PlexBrowse() {
   const dq = useDebounced(q.trim(), 350);
   // Active language for the HU overlay: "hu" serves Hungarian metadata, else EN. In the query keys so
   // a switch refetches the grid/facets/detail; useTranslation re-renders this component on switch.
-  const lang = plexLang();
+  const lang = plexLang(i18n.language);
   // The language the grid query is allowed to run at — lags `lang` by one render on a switch so the
   // genre-clear effect (below) can settle first (see the effect for why).
   const [committedLang, setCommittedLang] = useState(lang);
@@ -116,7 +116,7 @@ export default function PlexBrowse() {
   // The provider holds sort scope-agnostically; heal it against THIS scope's options so a movie-only
   // key (e.g. duration) left over from before a switch to shows doesn't ask for an unavailable sort.
   const sortState = healPlexSort(sort, scope);
-  const sortOptions = plexSortOptions(scope, (k) => t(`plex.sort.${k}`));
+  const sortOptions = plexSortOptions(scope, (k) => t(`plex.sort.${k}`), lang);
   // Same idiom for the search scope-pill: a movie-only scope can't hold the Episode field.
   const fieldState = healPlexField(field, scope);
   // Discover is the landing (E5 S4); the flat grid is the "Browse all" secondary view. A header search