fix(nav): stop Bootstrap .collapse from hiding desktop top bar

Markup used `collapse navbar-collapse`; BS5 hides `.collapse:not(.show)`.
Drop the `.collapse` class in the header shell and force desktop
`.navbar-collapse` to display:flex so menu/CTA/user/search stay visible.

assets/css/frontend/nav/zib-utilities.css

@@ -105,18 +105,27 @@ body.mobile-navbar-show { overflow: hidden; }
   margin: 0 auto;
   width: 100%;
 }
-.navbar-collapse {
+/* Beat Bootstrap 5 `.collapse:not(.show){display:none}` if legacy markup still
-  display: flex;
+   carries both classes. Desktop top bar is always a flex row. */
+.navbar-top .navbar-collapse,
+.navbar.navbar-top .collapse.navbar-collapse {
+  display: flex !important;
   align-items: center;
   flex: 1;
   min-width: 0;
   flex-wrap: nowrap;
+  visibility: visible;
+  height: auto;
+  overflow: visible;
 }
 .navbar-header { display: flex; align-items: center; flex-shrink: 0; }
 .navbar-top .navbar-toggle { display: none; background: none; border: 0; color: inherit; }
 @media (max-width: 767px) {
   .navbar-top .navbar-toggle { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; }
-  .navbar-collapse { display: none; }
+  .navbar-top .navbar-collapse,
+  .navbar.navbar-top .collapse.navbar-collapse {
+    display: none !important;
+  }
 }
 
 /* Senior submenu full width under fixed header */

inc/helpers/header/aksrt-header-render.php

@@ -169,7 +169,10 @@ $nav_style = '';
 
 		aksrt_navbar_header($ctx);
 
-		echo '<div class="collapse navbar-collapse">';
+		// Do NOT use Bootstrap's `.collapse` here — BS5 hides `.collapse:not(.show)`
+			// which would wipe the whole PC top bar (menu / CTA / user / search).
+			// Zibll uses a plain `.navbar-collapse` flex row; mobile uses the drawer.
+			echo '<div class="navbar-collapse">';
 		if ('3' !== $layout) {
 			aksrt_menu_items('primary', true);
 		}