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/lib/plexSort.ts

@@ -1,4 +1,5 @@
 import { healSort, type SortOption, type SortState } from "./columnSort";
+import { compareText } from "./collate";
 
 // Plex's sort vocabulary, source-agnostic like the feed's — a `SortOption[]` fed to the shared
 // SortControl. Direction lives in the SortState (no more sibling `sortDir` on PlexFilters); the wire
@@ -25,12 +26,16 @@ function plexSortKeys(scope: string): string[] {
  * SortState would otherwise corrupt the shared fallback for every caller. */
 export const PLEX_SORT_FALLBACK: SortState = Object.freeze({ key: "title", dir: "asc" as const });
 
-/** Labelled, alpha-ordered options for the SortControl. `label` resolves each key (i18n
- * `plex.sort.<key>`). */
-export function plexSortOptions(scope: string, label: (key: string) => string): SortOption[] {
+/** Labelled, alpha-ordered options for the SortControl, in the UI language's alphabet. `label`
+ * resolves each key (i18n `plex.sort.<key>`). */
+export function plexSortOptions(
+  scope: string,
+  label: (key: string) => string,
+  lang: string,
+): SortOption[] {
   return plexSortKeys(scope)
     .map((key) => ({ key, label: label(key) }))
-    .sort((a, b) => a.label.localeCompare(b.label));
+    .sort((a, b) => compareText(a.label, b.label, lang));
 }
 
 /** Heal a stored sort against a scope's available keys, collapsing an out-of-scope key to the default.