feat(widgets): category recommend/tabs residual + batch22-24 CSS

Use graphic_card heroes and mini post strips for category recommend,
prefer shared mini list in category block sidebar fallback, admin empty
for product tabs, and forum/user residual styles.

src/AKSRT/Widgets/CategoryTabsWidget.php

@@ -130,7 +130,7 @@ class CategoryTabsWidget extends \WP_Widget {
 					if(showMore&&more){
 						html+='<div class="aksrt-home-widget__footer"><a class="aksrt-home-widget__more" href="'+more+'">查看更多</a></div>';
 					}
-					panel.innerHTML=html||'<p class="widget-empty">暂无文章</p>';
+					panel.innerHTML=html||'<div class="ajax-item widget-empty muted-2-color">暂无文章</div>';
 					panel.setAttribute('data-loaded','1');
 					panel.classList.remove('is-ajax-loading');
 				}).catch(function(){panel.classList.remove('is-ajax-loading');});