feat(plex): every card rail in the reader's language; an episode in a poster rail stands as its show (E30 S1b)

The grid served Hungarian titles, but every other card surface (Discover rails, the
show page's episodes, search, collections, the person page, playlists, Home's resume
rail, hero and comfort shelf) served English. The card serializers now take a
required keyword-only lang (a forgotten call site fails instead of going English), and
each of those reads takes ?lang=hu, with the language in its query key. A Hungarian
search finds an episode by its Hungarian title too.

An episode on a poster rail showed its 16:9 still cropped into a poster, titled only
with the episode name; it now shows the show's poster and name, with S·E · title under
it (option A). Plex's generic season names (Season 1, Specials) are rebuilt from the
number in the reader's language; a season with a name of its own keeps it.

Home's comfort-shelf move wrote its optimistic order to the key without the language,
which nothing read any more; it writes the query's own key.

frontend/src/lib/api/discover.ts

@@ -71,8 +71,9 @@ export interface DiscoverPayload {
 }
 
 export const discoverApi = {
-  discover: (budget: DiscoverBudget, seed: number): Promise<DiscoverPayload> =>
-    req(`/api/discover?budget=${budget}&seed=${seed}`),
+  // `lang` "hu" serves a Plex card's Hungarian title (E30); en is the server default.
+  discover: (budget: DiscoverBudget, seed: number, lang?: string): Promise<DiscoverPayload> =>
+    req(`/api/discover?budget=${budget}&seed=${seed}${lang === "hu" ? "&lang=hu" : ""}`),
   // The "Mást kérek" reroll: a new hero alone, so pressing it does not re-fetch the rails under the
   // user's cursor.
   // `exclude` is the rolling list of `<source>:<id>` keys already shown. Without it a reroll only
@@ -84,12 +85,15 @@ export const discoverApi = {
     seed: number,
     exclude: string[] = [],
     press = 0,
+    lang?: string,
   ): Promise<{ budget: DiscoverBudget; hero: DiscoverHero | null }> =>
     req(
       `/api/discover/pick?budget=${budget}&seed=${seed}&start=${press}` +
-        (exclude.length ? `&exclude=${encodeURIComponent(exclude.join(","))}` : ""),
+        (exclude.length ? `&exclude=${encodeURIComponent(exclude.join(","))}` : "") +
+        (lang === "hu" ? "&lang=hu" : ""),
     ),
-  comfortPins: (): Promise<{ items: DiscoverCard[] }> => req("/api/discover/pins"),
+  comfortPins: (lang?: string): Promise<{ items: DiscoverCard[] }> =>
+    req(`/api/discover/pins${lang === "hu" ? "?lang=hu" : ""}`),
   addComfortPin: (
     kind: PinKind,
     ref: string,