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/ChannelPage.tsx

@@ -35,7 +35,7 @@ import { notifyYouTubeActionError } from "../lib/youtubeErrors";
 import { notifyActionError } from "../lib/actionErrors";
 import { api, DEFAULT_TAG_MODES, type FeedFilters, type Me, type ChannelDetail } from "../lib/api";
 import type { FeedView } from "../lib/feedView";
-import { channelYouTubeUrl, formatDate, formatViews } from "../lib/format";
+import { channelYouTubeUrl, formatDate, formatCompact } from "../lib/format";
 import { ChannelTagsControl } from "./ChannelTags";
 import { useChannelTagActions } from "../lib/useChannelTagActions";
 import { Button } from "./ui/Button";
@@ -70,6 +70,7 @@ export default function ChannelPage({
   onShowInFeed: () => void;
 }) {
   const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const { closeChannel } = useNavigationActions();
   const qc = useQueryClient();
   const confirm = useConfirm();
@@ -281,7 +282,7 @@ export default function ChannelPage({
   const metaParts = [
     ch?.handle ? `@${ch.handle.replace(/^@/, "")}` : null,
     ch?.subscriber_count != null
-      ? t("channel.subscribers", { formatted: formatViews(ch.subscriber_count) })
+      ? t("channel.subscribers", { formatted: formatCompact(ch.subscriber_count, lang) })
       : null,
     // Show "stored / total" when we only hold a subset of a subscribed channel's uploads, so the
     // gap between the browsable videos and YouTube's raw count is honest rather than looking like
@@ -292,7 +293,7 @@ export default function ChannelPage({
         : t("channel.videoCount", { count: ch.video_count })
       : null,
     ch?.total_view_count != null
-      ? t("channel.totalViews", { formatted: formatViews(ch.total_view_count) })
+      ? t("channel.totalViews", { formatted: formatCompact(ch.total_view_count, lang) })
       : null,
     // Per-type breakdown (R14 moved this off the manager table's N/S/L column). Only meaningful
     // once we actually hold some of the channel's videos.