Move liked tracks state to state/ and recently played merge to player/

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

@@ -0,0 +1,15 @@
+import { player } from '$lib/player/player.svelte';
+import type { Track } from '$lib/types';
+
+export function mergeRecentlyPlayed(history: Track[], limit: number): Track[] {
+	const seen = new Set<string>();
+	const merged: Track[] = [];
+
+	for (const track of [...player.recentlyPlayed, ...history]) {
+		if (seen.has(track.id)) continue;
+		seen.add(track.id);
+		merged.push(track);
+	}
+
+	return merged.slice(0, limit);
+}