feat(nav): complete remaining zibll parity (search, i18n, senior menus, CSS)

- Remove obsolete dual-path nav CSS; add utilities + language dropdown styles
- Wire header/mobile translate switcher from i18n config
- Layout-2 inline search hot keywords panel; nav_folding on resize
- NavMenuOptions JSON editors for graphic_card / multi_column_links
- Section-navs zibll posts-nav-lists; page-navs enqueue; mobile article TOC box
- SPA/PHP user-card publish type; rebuild admin assets

inc/helpers/header/aksrt-header-mobile.php

@@ -80,6 +80,9 @@ if (!function_exists('aksrt_nav_mobile_content')) :
 			$top_btns .= '<a href="javascript:;" class="toggle-radius main-search-btn" data-toggle-class data-target=".navbar-search" aria-label="'
 				. esc_attr__('打开搜索', 'aksrt') . '"><i class="fas fa-search" aria-hidden="true"></i></a>';
 		}
+		if (function_exists('aksrt_get_translate_language_btn')) {
+			$top_btns .= aksrt_get_translate_language_btn('pull-right');
+		}
 		if ($top_btns !== '') {
 			echo '<div class="flex ac pull-right" style="margin-right: -3px;">' . $top_btns . '</div>'; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 		}
@@ -116,6 +119,10 @@ if (!function_exists('aksrt_nav_mobile_content')) :
 		}
 		echo $menu; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 
+		if (is_singular('post')) {
+			echo '<div class="posts-nav-box" data-title="' . esc_attr__('文章目录', 'aksrt') . '"></div>';
+		}
+
 		// User box at bottom of drawer.
 		if (!empty($ctx['user_menu'])) {
 			echo aksrt_header_user_box_html($ctx); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped