feat(widgets): product lazy fallback and admin empty states

Lazyload product list fallback thumbs; surface widget_null admin empties
for notice/stats/faq/slider; stats cards gain data-aksrt-animate.

src/AKSRT/Widgets/NoticeWidget.php

@@ -20,7 +20,14 @@ class NoticeWidget extends \WP_Widget {
 
 	public function widget($args, $instance): void {
 		$items = $this->normalize_items($instance);
-		if (!$items) {
+if (!$items) {
+			if (current_user_can('manage_options')) {
+				echo $args['before_widget']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+				echo function_exists('aksrt_get_widget_null')
+					? aksrt_get_widget_null(__('请添加至少一条公告', 'aksrt')) // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+					: '<p class="widget-empty">' . esc_html__('请添加至少一条公告', 'aksrt') . '</p>';
+				echo $args['after_widget']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+			}
 			return;
 		}