feat(frontend): replace lazy loading with zibll lazysizes

inc/helpers/user-center-renderers/profile-level.php

@@ -63,7 +63,7 @@ $day_max = \AKSRT\User\Level::day_max();
 				<div class="uc-level-road__item<?php echo esc_attr($state); ?>">
 					<div class="uc-level-road__icon">
 						<?php $icon = \AKSRT\User\Level::get_level_icon_url($level); ?>
-						<?php if ($icon !== '') : ?><img src="<?php echo esc_url($icon); ?>" alt="" loading="lazy"><?php else : ?><span>LV<?php echo esc_html((string) $level); ?></span><?php endif; ?>
+						<?php if ($icon !== '') : ?><img<?php echo aksrt_get_lazy_attr('lazy_other', (string) $icon); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?> alt=""><?php else : ?><span>LV<?php echo esc_html((string) $level); ?></span><?php endif; ?>
 					</div>
 					<strong><?php echo esc_html($name); ?></strong>
 					<small><?php echo esc_html((string) $need); ?> EXP</small>