implemented permission system

frontend/src/lib/components/Header.svelte

@@ -5,6 +5,8 @@
 	import { page } from '$app/stores';
 	import { t } from 'svelte-i18n';
 	import { writable } from 'svelte/store';
+	import { PERMISSIONS } from '$lib/utils/constants';
+	import { hasPrivilige } from '$lib/utils/helpers';
 
 	let isMobileMenuOpen = false;
 
@@ -104,7 +106,7 @@
 						{$page.data.user.last_name}
 					</a>
 				</div>
-				{#if $page.data.user.role_id > 0}
+				{#if hasPrivilige($page.data.user, PERMISSIONS.View)}
 					<div
 						class="header-nav-item"
 						class:active={$page.url.pathname.startsWith(`${base}/auth/admin/users`)}