feat(frontend): replace lazy loading with zibll lazysizes

inc/helpers/user-center-renderers/sidebar-vip.php

@@ -48,7 +48,7 @@ if ($vip_level > 0) {
 $sidebar_level = $vip_level > 0 ? $vip_level : $expired_level;
 $sidebar_icon_url = esc_url((string) ($vip_levels[$sidebar_level]['img_icon'] ?? ''));
 $sidebar_icon = $sidebar_icon_url !== ''
-	? '<img class="aksrt-vip-level-icon" src="' . $sidebar_icon_url . '" alt="" loading="lazy" decoding="async">'
+	? '<img' . aksrt_get_lazy_attr('lazy_other', $sidebar_icon_url, 'aksrt-vip-level-icon') . ' alt="" decoding="async">'
 	: '<i class="fas fa-crown" aria-hidden="true"></i>';
 ?>
 <a class="uc-sidebar-vip" href="<?php echo esc_url($vip_url); ?>" data-tab="vip">