专用页对齐 content-shell，并删 page-header query-var 回退

archives/friends/newposts/posts-navs/categories 统一壳层与 page-header 契约，
主路径不再保留 aksrt_ph_* ambient 传参。

templates/pages/page-categories.php

@@ -46,26 +46,31 @@ if ($page_title === '') {
 }
 ?>
 
-<main id="main-content" class="site-main content-shell" tabindex="-1">
-	<?php if (function_exists('aksrt_breadcrumbs')) {
-		aksrt_breadcrumbs();
-	} ?>
+<?php
+if (function_exists('aksrt_archive_open_shell')) {
+	aksrt_archive_open_shell([
+		'main_class'  => 'site-main container content-shell content-shell--page',
+		'has_sidebar' => false,
+		'page_kind'   => 'categories',
+	]);
+}
+?>
+					<div class="content-main content-main--page content-main--categories">
+						<?php if (function_exists('aksrt_breadcrumbs')) { aksrt_breadcrumbs(); } ?>
+						<?php
+						$cats_meta = sprintf(
+							/* translators: 1: total category count, 2: total published post count */
+							esc_html__('共 %1$d 个分类 · 共 %2$d 篇文章', 'aksrt'),
+							$total_cats,
+							$total_posts
+						);
+						get_template_part('templates/parts/page-header', null, [
+							'title' => esc_html($page_title),
+							'desc'  => $cats_meta,
+						]);
+						?>
 
-	<header class="page-header aksrt-cats-header">
-		<h1 class="entry-title"><?php echo esc_html($page_title); ?></h1>
-		<p class="aksrt-cats-header__meta">
-			<?php
-			printf(
-				/* translators: 1: total category count, 2: total published post count */
-				esc_html__('共 %1$d 个分类 · 共 %2$d 篇文章', 'aksrt'),
-				$total_cats,
-				$total_posts
-			);
-			?>
-		</p>
-	</header>
-
-	<?php if (!empty($top_level)) : ?>
+<?php if (!empty($top_level)) : ?>
 		<section class="aksrt-cats-grid" aria-label="<?php esc_attr_e('分类列表', 'aksrt'); ?>">
 			<?php foreach ($top_level as $cat) :
 				$cat_id    = (int) $cat->term_id;
@@ -124,7 +129,11 @@ if ($page_title === '') {
 			<?php esc_html_e('返回首页', 'aksrt'); ?>
 		</a>
 	</p>
-</main>
 
+					</div>
 <?php
+if (function_exists('aksrt_archive_close_shell')) {
+	aksrt_archive_close_shell(['has_sidebar' => false]);
+}
+
 get_footer();