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/comfortPin.tsx

@@ -95,7 +95,7 @@ export interface ComfortPin {
  * every feed load would be a real request for a string almost nobody reads that session.
  */
 export function useComfortPin(open: boolean): ComfortPin {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
   const qc = useQueryClient();
   // Latch: react-query keeps the data cached when `enabled` goes false again, so this only decides
   // WHEN the first fetch happens, not whether the answer survives the menu closing.
@@ -105,8 +105,8 @@ export function useComfortPin(open: boolean): ComfortPin {
   if (open && !everOpen) setEverOpen(true);
 
   const shelf = useQuery({
-    queryKey: qk.comfortPins(plexLang()),
-    queryFn: () => api.comfortPins(plexLang()),
+    queryKey: qk.comfortPins(plexLang(i18n.language)),
+    queryFn: () => api.comfortPins(plexLang(i18n.language)),
     enabled: everOpen,
     // The shelf is hand-curated and short; re-asking on every menu open would be noise.
     staleTime: 60_000,