Move domain data helpers into lib/data

web-player/src/lib/data/recentlyPlayed.ts

@@ -0,0 +1,22 @@
+import { player, toQueueItems, type ApiTrackLike, type QueueItem } from '$lib/player/player.svelte';
+
+export function mergeRecentlyPlayed(history: ApiTrackLike[], limit: number): QueueItem[] {
+	const seen = new Set<string>();
+	const merged: QueueItem[] = [];
+
+	for (const t of player.recentlyPlayed) {
+		const id = String(t.id);
+		if (seen.has(id)) continue;
+		seen.add(id);
+		merged.push({ ...t, id });
+	}
+
+	for (const item of toQueueItems(history)) {
+		const id = String(item.id);
+		if (seen.has(id)) continue;
+		seen.add(id);
+		merged.push({ ...item, id });
+	}
+
+	return merged.slice(0, limit);
+}