Fix sleep bug, fix menu return

src/lib/utils/heroMix.ts

@@ -0,0 +1,59 @@
+// Hero banner mix builder, shared by the movies/TV/music landing stores.
+//
+// The hero used to show the first N items of fixed pools (continue watching,
+// recently played, latest), which made it identical on every visit. Instead we
+// sample a couple of items at random from each pool — pools are ordered most
+// personal first — and shuffle the rotation, so the banner is a fresh mix each
+// time while still leading with something personal.
+// TRACES: UR-034 | DR-038
+import type { MediaItem } from "$lib/api/types";
+
+/** Fisher-Yates shuffle; returns a new array, input is untouched. */
+export function shuffle<T>(items: T[]): T[] {
+  const result = [...items];
+  for (let i = result.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [result[i], result[j]] = [result[j], result[i]];
+  }
+  return result;
+}
+
+/**
+ * Build a varied hero rotation from ordered pools (most personal first).
+ *
+ * Takes up to `perPool` random items from each pool, de-duplicated by id and
+ * filtered to items with usable artwork. The first pick from the first
+ * non-empty pool leads the rotation (so a resumable/recent item greets the
+ * user), the rest are shuffled. If that yields fewer than `count` items, the
+ * remainder is backfilled from whatever is left across all pools.
+ */
+export function buildHeroMix(
+  pools: MediaItem[][],
+  hasArt: (item: MediaItem) => boolean,
+  count = 6,
+  perPool = 2
+): MediaItem[] {
+  const seen = new Set<string>();
+  const usable = pools.map(pool =>
+    pool.filter(item => {
+      if (!hasArt(item) || seen.has(item.id)) return false;
+      seen.add(item.id);
+      return true;
+    })
+  );
+
+  const picked = new Set<string>();
+  const picks: MediaItem[] = [];
+  for (const pool of usable) {
+    for (const item of shuffle(pool).slice(0, perPool)) {
+      picked.add(item.id);
+      picks.push(item);
+    }
+  }
+
+  if (picks.length === 0) return [];
+
+  const [leader, ...rest] = picks;
+  const leftovers = shuffle(usable.flat().filter(item => !picked.has(item.id)));
+  return [leader, ...shuffle(rest), ...leftovers].slice(0, count);
+}