feat(web-player): show YouTube Music albums in the explore search

The Albums chip now returns both your own albums and what YouTube Music has
for the term. A YouTube card opens a read-only album page with its cover,
tracklist and play button, and right-clicking a track still offers to add it
to a playlist through the existing menu.

web-player/src/routes/(app)/albums/youtube/[albumId]/+page.server.ts

@@ -0,0 +1,23 @@
+import type { PageServerLoad, Actions } from './$types';
+import { createApiClient, requireUser, unwrapOrError } from '$lib/server/api';
+import { addYouTubeToPlaylistAction } from '$lib/server/playlistActions';
+
+export const load: PageServerLoad = async ({ params, locals, url, fetch }) => {
+	const user = requireUser(locals, url);
+	const api = createApiClient({ fetch, accessToken: locals.accessToken ?? undefined });
+
+	const [albumRes, playlistsRes] = await Promise.all([
+		api.GET('/youtube/albums/{albumId}', { params: { path: { albumId: params.albumId } } }),
+		api.GET('/playlists/users/{userId}', {
+			params: { path: { userId: user.sub }, query: { pageNumber: 1, pageSize: 50 } }
+		})
+	]);
+
+	const album = unwrapOrError(albumRes, 'No se pudo cargar el álbum de YouTube Music.', 404);
+
+	return { album, playlists: playlistsRes.data?.items ?? [] };
+};
+
+export const actions: Actions = {
+	addYouTubeToPlaylist: addYouTubeToPlaylistAction
+};