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/+page.server.ts

@@ -2,18 +2,19 @@ export const prerender = false;
 
 import { redirect } from '@sveltejs/kit';
 import type { PageServerLoad } from './$types';
+import { AppRoute } from '$lib/constants';
 
 export const load = (async ({ parent, locals: { api } }) => {
 	const { user } = await parent();
 	if (user) {
-		throw redirect(302, '/photos');
+		throw redirect(302, AppRoute.PHOTOS);
 	}
 
 	const { data } = await api.userApi.getUserCount({ admin: true });
 
 	if (data.userCount > 0) {
 		// Redirect to login page if an admin is already registered.
-		throw redirect(302, '/auth/login');
+		throw redirect(302, AppRoute.AUTH_LOGIN);
 	}
 
 	return {