fix(web): redirect to parent folder if asset viewer was open before reload (#2863)

* fix(web): redirect to parent folder if asset viewer was open before reload

* chore(web): use route constants in all routes

web/src/routes/(user)/favorites/[assetId]/+page.server.ts

@@ -2,13 +2,14 @@ import { redirect } from '@sveltejs/kit';
 export const prerender = false;
 
 import type { PageServerLoad } from './$types';
+import { AppRoute } from '$lib/constants';
 
 export const load: PageServerLoad = async ({ parent }) => {
 	const { user } = await parent();
 
 	if (!user) {
-		throw redirect(302, '/auth/login');
+		throw redirect(302, AppRoute.AUTH_LOGIN);
 	} else {
-		throw redirect(302, '/favorites');
+		throw redirect(302, AppRoute.FAVORITES);
 	}
 };