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/lib/server/followActions.ts

@@ -0,0 +1,28 @@
+import { fail, type RequestEvent } from '@sveltejs/kit';
+import { createApiClient, requireAccessTokenAction } from '$lib/server/api';
+
+async function setFollowing({ request, params, locals, fetch }: RequestEvent, follow: boolean) {
+	const accessToken = requireAccessTokenAction(locals);
+	if (typeof accessToken !== 'string') return accessToken;
+
+	const form = await request.formData();
+	const id = String(form.get('userId') ?? '') || String(params.id ?? '');
+	if (!id) return fail(400, { message: 'Falta el usuario.' });
+
+	const api = createApiClient({ fetch, accessToken });
+	const options = { params: { path: { id } } };
+	const { error } = follow
+		? await api.POST('/users/{id}/follow', options)
+		: await api.DELETE('/users/{id}/follow', options);
+
+	if (error) {
+		return fail(502, {
+			message: follow ? 'No se pudo seguir al usuario.' : 'No se pudo dejar de seguir al usuario.'
+		});
+	}
+
+	return { following: follow, userId: id };
+}
+
+export const followUserAction = (event: RequestEvent) => setFollowing(event, true);
+export const unfollowUserAction = (event: RequestEvent) => setFollowing(event, false);