fix(frontend): restore missing search hot keywords renderer

Add aksrt_render_search_hot_keywords() used by header/search/404 panels to stop fatal undefined function on front-page.

inc/helpers/aksrt-template-tags.php

@@ -567,6 +567,58 @@ function aksrt_get_search_hot_keywords(): array {
 }
 endif;
 
+if (!function_exists('aksrt_render_search_hot_keywords')):
+/**
+ * Render hot search keyword chips.
+ *
+ * Used by header drawer, global search panel, search results, and 404.
+ *
+ * @param array<int,string>|null $keywords Optional preloaded keywords.
+ * @param string                 $class    Wrapper class name.
+ */
+function aksrt_render_search_hot_keywords($keywords = null, string $class = 'aksrt-search-hot-keywords'): void {
+    if ($keywords === null) {
+        $keywords = aksrt_get_search_hot_keywords();
+    }
+    if (!is_array($keywords)) {
+        $keywords = [];
+    }
+
+    $items = [];
+    foreach ($keywords as $keyword) {
+        $keyword = trim(sanitize_text_field((string) $keyword));
+        if ($keyword !== '') {
+            $items[] = $keyword;
+        }
+    }
+    $items = array_values(array_unique($items));
+    if ($items === []) {
+        return;
+    }
+
+    $class = trim(sanitize_html_class(str_replace(' ', '-', $class), 'aksrt-search-hot-keywords'));
+    if ($class === '') {
+        $class = 'aksrt-search-hot-keywords';
+    }
+
+    $label = class_exists('AKSRT_Settings') && method_exists('AKSRT_Settings', 'search_popular_title')
+        ? (string) AKSRT_Settings::search_popular_title()
+        : __('热门搜索', 'aksrt');
+    if ($label === '') {
+        $label = __('热门搜索', 'aksrt');
+    }
+
+    echo '<div class="' . esc_attr($class) . '">';
+    echo '<span class="' . esc_attr($class . '__label') . '">' . esc_html($label) . '</span>';
+    echo '<div class="' . esc_attr($class . '__list') . '">';
+    foreach ($items as $keyword) {
+        $url = add_query_arg('s', rawurlencode($keyword), home_url('/'));
+        echo '<a class="' . esc_attr($class . '__item') . '" href="' . esc_url($url) . '">' . esc_html($keyword) . '</a>';
+    }
+    echo '</div></div>';
+}
+endif;
+
 if (!function_exists('aksrt_search_history_enabled')):
 /**
  * 是否启用搜索历史