fix: scope admin bar offcanvas padding to mobile viewports (v1.0.12)

Wrap the offcanvas padding-top rule in a max-width: 991.98px media query
so it only applies when the offcanvas is active, not on wide screens
where the navbar renders inline.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

functions.php

@@ -86,7 +86,7 @@ if ( ! function_exists( 'wp_bootstrap_enqueue_scripts' ) ) :
         // Push offcanvas below the WP admin bar when logged in.
         if ( is_admin_bar_showing() ) {
             wp_add_inline_style( 'wp-bootstrap-style',
-                '.offcanvas { padding-top: var(--wp-admin--admin-bar--height, 32px); }'
+                '@media (max-width: 991.98px) { .offcanvas { padding-top: var(--wp-admin--admin-bar--height, 32px); } }'
             );
         }