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/classes/frontend/class-aksrt-inline-style-builder.php

@@ -105,6 +105,8 @@ class AKSRT_Inline_Style_Builder {
             . '.aksrt-search-hot-keywords{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px;font-family:var(--font-ui);}'
             . '.aksrt-search-hot-keywords__label{font-size:12px;color:var(--color-ink-3);}'
             . '.aksrt-search-hot-keywords__list{display:flex;gap:8px;flex-wrap:wrap;}'
+            . '.aksrt-search-hot-keywords__item{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:var(--surface-2,#f3f4f6);color:var(--color-ink-2,#374151);font-size:12px;line-height:1.4;text-decoration:none;}'
+            . '.aksrt-search-hot-keywords__item:hover{background:var(--color-primary,#2563eb);color:#fff;}'
             . '.site-footer__copyright--extra{margin-top:8px;opacity:.78;}'
             . '</style>' . "\n";
     }