fix(notifications): a confirm names its user and channel again; t() and a notice's text are kept apart by a contract

The value sweep wrapped two plain t() values in raw(), so the delete-user and the YouTube subscribe
confirms read "[object Object]" where the email or the channel was. tsc cannot see that seam, so a
syntax contract now refuses a notice value handed to t() and an already-said text kept in a notice.
The raw() doc says what it is: text kept as fetched (a Plex title in the language it was fetched in).
seasonTitleText's no-number branches are tested.

frontend/src/modules/channels/useWatchedChannelActions.ts

@@ -54,7 +54,7 @@ export function useWatchedChannelActions(onOpenWizard: () => void) {
   const onSubscribe = async (c: WatchedChannel): Promise<boolean> => {
     const ok = await confirm({
       title: t("channels.discovery.subscribe"),
-      message: t("channels.discovery.confirmSubscribe", { name: raw(nameOf(c)) }),
+      message: t("channels.discovery.confirmSubscribe", { name: nameOf(c) }),
       confirmLabel: t("channels.discovery.subscribe"),
     });
     if (ok) subscribe.mutate(c);