feat(widgets): friend-links bookmarks source, hot thumbs, cover video

Deepen existing widgets toward zibll: WP bookmarks source for friend
links, optional hot-post thumbnails, and video backgrounds on cover
cards.

src/AKSRT/Widgets/HotPostsWidget.php

@@ -27,6 +27,7 @@ class HotPostsWidget extends \WP_Widget {
         $count    = absint($instance['count'] ?? 5);
         $order_by = $instance['order_by'] ?? 'views';
         $days     = absint($instance['days'] ?? 30);
+        $show_thumb = !empty($instance['show_thumb']);
 
         if ($title) {
             echo $args['before_title'] . esc_html($title) . $args['after_title'];
@@ -85,6 +86,13 @@ class HotPostsWidget extends \WP_Widget {
                     ?>
                     <div class="hot-post-item <?php echo esc_attr($rank_class); ?>">
                         <span class="hot-post-item__rank"><?php echo esc_html($index); ?></span>
+                        <?php if ($show_thumb) :
+                            $thumb = get_the_post_thumbnail_url(get_the_ID(), 'thumbnail');
+                            ?>
+                            <a class="hot-post-item__thumb<?php echo $thumb ? '' : ' is-empty'; ?>" href="<?php the_permalink(); ?>">
+                                <?php if ($thumb) : ?><img src="<?php echo esc_url($thumb); ?>" alt="" loading="lazy" /><?php endif; ?>
+                            </a>
+                        <?php endif; ?>
                         <div class="hot-post-item__info">
                             <a href="<?php the_permalink(); ?>" class="hot-post-item__title"><?php the_title(); ?></a>
                             <div class="hot-post-item__meta">
@@ -132,7 +140,11 @@ class HotPostsWidget extends \WP_Widget {
             <label for="<?php echo $this->get_field_id('days'); ?>"><?php esc_html_e('时间范围（天，0=不限）:', 'aksrt'); ?></label>
             <input class="tiny-text" id="<?php echo $this->get_field_id('days'); ?>" name="<?php echo $this->get_field_name('days'); ?>" type="number" min="0" max="365" value="<?php echo $days; ?>">
         </p>
-        <?php
+        
+        <p>
+            <label><input type="checkbox" name="<?php echo esc_attr($this->get_field_name('show_thumb')); ?>" value="1" <?php checked(!empty($instance['show_thumb'])); ?>> <?php esc_html_e('显示缩略图', 'aksrt'); ?></label>
+        </p>
+<?php
     }
 
     public function update($new_instance, $old_instance): array {