fix(notifications): a notice value is no plain string, so a translated name cannot freeze in one language

A name goes in as raw(), a translated word as its own msg(): tsc now lists every value, and the
ones that froze are said when shown — Watch later and an untitled channel in the pin and channel
notices, a Plex season's name in its removal toast (a new seasonTitleText, which seasonTitle says).

frontend/src/lib/plexDetail.ts

@@ -3,6 +3,7 @@ import { REDUCED_MOTION, useMediaQuery } from "./useMediaQuery";
 import { usePref, useSavePref } from "./usePref";
 import type { TFunction } from "i18next";
 import type { PlexCard, PlexTmdb } from "./api";
+import { msg, raw, sayNotif, type NotifText } from "./notifications";
 
 // The non-component half of the shared Plex "detail page" UI (see plexDetailUi): the per-user display
 // prefs, the TMDB backdrop URL, the crossfading art backdrop hook and the episode label. Split out so
@@ -241,9 +242,17 @@ export function seasonTitle(
   se: { title?: string | null; season_number?: number | null },
   t: TFunction,
 ): string {
+  return sayNotif(seasonTitleText(se), t);
+}
+
+/** The season's name as a notice keeps it: said in the reader's language each time it is shown. */
+export function seasonTitleText(se: {
+  title?: string | null;
+  season_number?: number | null;
+}): NotifText {
   const n = se.season_number;
-  if (se.title && !GENERIC_SEASON.test(se.title.trim())) return se.title;
-  if (n === 0) return t("plex.specials");
-  if (n != null) return t("plex.seasonTitle", { n });
-  return se.title || t("plex.playlist.seasonUnknown");
+  if (se.title && !GENERIC_SEASON.test(se.title.trim())) return raw(se.title);
+  if (n === 0) return msg("plex.specials");
+  if (n != null) return msg("plex.seasonTitle", { n });
+  return se.title ? raw(se.title) : msg("plex.playlist.seasonUnknown");
 }