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/plexCards.tsx

@@ -2,7 +2,7 @@ import { useTranslation } from "react-i18next";
 import { CheckCircle2, Circle, Info, ListPlus, Star } from "lucide-react";
 import clsx from "clsx";
 import { type ReactNode, useRef } from "react";
-import { formatRuntime } from "../lib/format";
+import { formatDecimal, formatRuntime } from "../lib/format";
 import { Carousel } from "./ui/Carousel";
 import type { PlexCard, PlexCastMember, PlexFilters, PlexSeasonDetail } from "../lib/api";
 import { seasonTitle } from "../lib/plexDetail";
@@ -287,7 +287,8 @@ export function PlexPosterCard({
   /** The show's page, beside a `next` episode. */
   onInfo?: () => void;
 }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const preview = useMediaPreview();
   // An episode in a poster rail (Discover's "Recently watched") stands as its SHOW: the show's poster
   // and name, the episode on the line under it (E30, option A). Its own 16:9 still in a poster slot
@@ -302,7 +303,7 @@ export function PlexPosterCard({
   const acted = ep ?? card;
   const watched = card.status === "watched";
   const actedWatched = acted.status === "watched";
-  const runtime = formatRuntime(card.duration_seconds);
+  const runtime = formatRuntime(card.duration_seconds, lang);
   const pct = ep ? progressPct(ep) : watched ? 0 : progressPct(card);
   const m = more(card, menuButtonProps, menuOpen);
   const toggle = isPlayable && onToggleWatched ? () => onToggleWatched(acted) : undefined;
@@ -317,7 +318,7 @@ export function PlexPosterCard({
   const rating = card.rating != null && (
     <span className="inline-flex items-center gap-0.5">
       <Star className="w-3 h-3 fill-current text-rating" aria-hidden />
-      {card.rating.toFixed(1)}
+      {formatDecimal(card.rating, lang)}
     </span>
   );
   return (
@@ -649,11 +650,12 @@ export function EpisodeCard({
   menuOpen?: boolean;
   navIndex?: number;
 }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const watched = ep.status === "watched";
   const pct = watched ? 0 : progressPct(ep);
   const m = more(ep, menuButtonProps, menuOpen);
-  const runtime = formatRuntime(ep.duration_seconds);
+  const runtime = formatRuntime(ep.duration_seconds, lang);
   return (
     <MediaCard
       dense