Add follow button next to each user in search results

Extract FollowButton and shared follow/unfollow actions, reused by the user profile page.

web-player/src/routes/(app)/explore/+page.server.ts

@@ -1,6 +1,7 @@
 import type { PageServerLoad, Actions } from './$types';
 import { createApiClient, unwrapOrError } from '$lib/server/api';
 import { addAlbumToPlaylistAction, addTrackAction } from '$lib/server/playlistActions';
+import { followUserAction, unfollowUserAction } from '$lib/server/followActions';
 import {
 	EXPLORE_ALBUMS_PAGE_SIZE,
 	EXPLORE_PAGE_SIZE as PAGE_SIZE,
@@ -45,16 +46,38 @@ export const load: PageServerLoad = async ({ url, locals, fetch }) => {
 
 	const tracks = unwrapOrError(tracksRes, 'No se pudieron cargar las canciones.');
 
+	const userItems = usersRes?.data?.items ?? [];
+	const followedIds = user
+		? await Promise.all(
+				userItems
+					.filter((u) => u.id !== user.sub)
+					.map((u) =>
+						api
+							.GET('/users/{id}/is-following', { params: { path: { id: u.id } } })
+							.then((res) => (res.data ? u.id : null))
+							.catch(() => null)
+					)
+			)
+		: [];
+	const followed = new Set(followedIds);
+
 	return {
 		query,
 		tracks,
 		albums: (albumsRes?.data?.items ?? []).map((item) => item.album),
-		users: usersRes?.data?.items ?? [],
+		users: userItems.map((u) => ({
+			...u,
+			isSelf: user?.sub === u.id,
+			isFollowing: followed.has(u.id)
+		})),
+		canFollow: !!user,
 		playlists: playlistsRes?.data?.items ?? []
 	};
 };
 
 export const actions: Actions = {
 	addTrack: addTrackAction,
-	addAlbumToPlaylist: addAlbumToPlaylistAction
+	addAlbumToPlaylist: addAlbumToPlaylistAction,
+	follow: followUserAction,
+	unfollow: unfollowUserAction
 };