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/DebugRecorder.tsx

@@ -372,7 +372,8 @@ const chipTone = (s: DebugSession): string => {
 
 /** The last sessions, newest first — reopening one opens its composer, with what was written. */
 function SessionHistory() {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const q = useQuery({ queryKey: qk.debugSessions(), queryFn: api.debugSessions });
   const items = q.data?.items.filter((s) => s.ended_at) ?? [];
   if (q.isError && !q.data)
@@ -394,7 +395,7 @@ function SessionHistory() {
               key={s.id}
               className="flex flex-wrap items-center gap-x-3 gap-y-1 px-3 py-2 text-sm"
             >
-              <span className="tabular-nums">{formatDateTimeSec(s.started_at)}</span>
+              <span className="tabular-nums">{formatDateTimeSec(s.started_at, lang)}</span>
               <span className="min-w-0 flex-1 truncate text-muted">
                 {s.draft?.title || t(`settings.diagnostics.levels.${s.level}`)}
               </span>