feat(web): series detail metadata header

web/src/series.ts

@@ -2,6 +2,7 @@
 // release schemas — same reasoning as search.ts: the generated client
 // (src/api/) is uncommitted, so CI's tsc cannot see it.
 
+import type { MetadataCastMember, MetadataTrailer } from "./movie";
 import type { ActionOutcome, MovieRelease, ReleasesOutcome, WaiveOutcome } from "./releases";
 import { errorDetail, probedAttributeTags, waiverOverride } from "./releases";
 
@@ -239,6 +240,46 @@ export async function waiveAndGrabTv(
   return { kind: "done", overrideWritten };
 }
 
+/* ---- §9.6 rich detail --------------------------------------------------- */
+
+/** Rich detail for one library series' §9.6 page (#146). */
+export interface SeriesMetadata {
+  tmdb_id: number;
+  overview: string | null;
+  tagline: string | null;
+  genres: string[];
+  /** Minutes per episode. */
+  runtime: number | null;
+  status: string;
+  poster_path: string | null;
+  backdrop_path: string | null;
+  /** `null` when TMDB has no votes for the title (#156). */
+  vote_average: number | null;
+  vote_count: number;
+  homepage: string | null;
+  /** §9.6 links out to TVDB for series; absent when the id is unknown. */
+  tvdb_id: number | null;
+  cast: MetadataCastMember[];
+  trailer: MetadataTrailer | null;
+}
+
+export type SeriesMetadataOutcome =
+  | { kind: "metadata"; metadata: SeriesMetadata }
+  | { kind: "error"; detail: string };
+
+/** One request for everything above the season tree (§9.6). */
+export async function seriesMetadata(seriesId: number): Promise<SeriesMetadataOutcome> {
+  try {
+    const response = await fetch(`/api/series/${seriesId}/metadata`);
+    if (!response.ok) {
+      return { kind: "error", detail: await errorDetail(response) };
+    }
+    return { kind: "metadata", metadata: (await response.json()) as SeriesMetadata };
+  } catch {
+    return { kind: "error", detail: "daemon unreachable" };
+  }
+}
+
 /* ---- display helpers --------------------------------------------------- */
 
 /** Wanted / on-disk counts for one season, whatever its number. */