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.

page.php

@@ -91,13 +91,13 @@ $show_sidebar = function_exists('aksrt_is_show_sidebar') ? aksrt_is_show_sidebar
 					<?php dynamic_sidebar('page_bottom_content_' . $page_id); ?>
 				<?php endif; ?>
 			</div>
-
-			<?php if ($show_sidebar) : ?>
-				<?php get_sidebar(); ?>
-			<?php endif; ?>
 		</div>
 	</div>
 
+	<?php if ($show_sidebar) : ?>
+		<?php get_sidebar(); ?>
+	<?php endif; ?>
+
 	<?php if (is_active_sidebar('page_bottom_fluid_' . $page_id)) : ?>
 	<div class="fluid-widget-wrap">
 		<?php dynamic_sidebar('page_bottom_fluid_' . $page_id); ?>