feat(frontend): adopt zibll site-layout-1/2/3 float dual-column system

Wire settings-driven sidebar visibility and body site-layout classes,
replace content-layout CSS grid with Zibll float geometry, move sidebar
DOM to content-wrap sibling across single/archive/page/home, and add
post meta show_layout overrides.

sidebar.php

@@ -3,6 +3,8 @@
  * Sidebar template for generic pages.
  *
  * Single/home own their asides. This template only serves archive/page contexts.
+ * Callers only include this when aksrt_is_show_sidebar() is true.
+ * Keep the column even if widgets are empty (zibll parity).
  *
  * @package AKSRT
  */
@@ -16,12 +18,6 @@ if (wp_is_mobile()) {
 $sidebar_id = function_exists('aksrt_resolve_sidebar_id')
 	? aksrt_resolve_sidebar_id()
 	: 'sidebar-blog';
-
-if (!is_active_sidebar($sidebar_id)
-	&& !is_active_sidebar('all_sidebar_top')
-	&& !is_active_sidebar('all_sidebar_bottom')) {
-	return;
-}
 ?>
 
 <div class="sidebar" role="complementary" aria-label="<?php esc_attr_e('侧栏', 'aksrt'); ?>">
@@ -31,6 +27,10 @@ if (!is_active_sidebar($sidebar_id)
 
 	<?php if (is_active_sidebar($sidebar_id)) : ?>
 		<?php dynamic_sidebar($sidebar_id); ?>
+	<?php elseif ((is_home() || is_front_page()) && is_active_sidebar('home_sidebar')) : ?>
+		<?php dynamic_sidebar('home_sidebar'); ?>
+	<?php elseif ((is_home() || is_front_page()) && is_active_sidebar('sidebar-blog')) : ?>
+		<?php dynamic_sidebar('sidebar-blog'); ?>
 	<?php endif; ?>
 
 	<?php if (is_active_sidebar('all_sidebar_bottom')) : ?>