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.

inc/helpers/aksrt-archive.php

@@ -275,26 +275,19 @@ if (!function_exists('aksrt_archive_has_sidebar')) :
 	/**
 	 * Resolve whether a stream page should show an aside.
 	 *
-	 * @param string $preferred Preferred sidebar id.
+	 * @param string $preferred Preferred sidebar id (compat only).
 	 * @param bool   $enabled   Page-level sidebar toggle.
 	 */
 	function aksrt_archive_has_sidebar(string $preferred = '', bool $enabled = true): bool {
-		if (!$enabled || wp_is_mobile()) {
+		// $preferred kept for call-site compat; visibility is settings/meta driven (zibll).
+		unset($preferred);
+		if (!$enabled) {
 			return false;
 		}
-
-		if ($preferred !== '' && is_active_sidebar($preferred)) {
-			return true;
-		}
-
 		if (function_exists('aksrt_is_show_sidebar')) {
 			return aksrt_is_show_sidebar();
 		}
-
-		$fallback = function_exists('aksrt_resolve_sidebar_id') ? aksrt_resolve_sidebar_id() : 'sidebar-blog';
-		return is_active_sidebar($fallback)
-			|| is_active_sidebar('all_sidebar_top')
-			|| is_active_sidebar('all_sidebar_bottom');
+		return !wp_is_mobile();
 	}
 endif;
 
@@ -440,6 +433,7 @@ endif;
 if (!function_exists('aksrt_archive_close_shell')) :
 	/**
 	 * Close a shared archive shell.
+	 * Sidebar is a sibling of .content-wrap (Zibll float dual-column).
 	 *
 	 * @param array<string,mixed> $args Shell args.
 	 */
@@ -450,11 +444,11 @@ if (!function_exists('aksrt_archive_close_shell')) :
 		]);
 		?>
 					</div>
-					<?php if (!empty($args['has_sidebar'])) : ?>
-						<?php get_sidebar(); ?>
-					<?php endif; ?>
 				</div>
 			</div>
+			<?php if (!empty($args['has_sidebar'])) : ?>
+				<?php get_sidebar(); ?>
+			<?php endif; ?>
 			<?php
 			if (!empty($args['bottom_fluid']) && is_array($args['bottom_fluid'])) {
 				aksrt_archive_render_widget_zone($args['bottom_fluid'], 'fluid-widget-wrap');