feat(nav): rewrite top header to zibll 1:1 DOM/CSS/JS contract

Replace hybrid site-nav/drawer shell with zibll navbar-top layouts 1/2/3,
body.mobile-navbar-show drawer, wired NavWalker + aksrt_menu_options meta,
nav_folding/chevron, VIP switches, and SPA/PHP schema parity. No dual-class
compat paths.

assets/js/mini-touch.js

@@ -182,10 +182,10 @@
         el.style.transform = 'translateX(100%)';
         el.style.opacity = '0';
         setTimeout(function () {
-          el.classList.remove('is-open');
           el.style.transform = '';
           el.style.opacity = '';
-          document.body.classList.remove('nav-open');
+          // Zibll contract: drawer open state lives on body.
+          document.body.classList.remove('mobile-navbar-show');
         }, 200);
       } else {
         el.style.transition = 'transform 0.2s, opacity 0.2s';