fix(nav): restore publish/VIP hover bridge and fixed CTA size

Close dead zone under 发布 (transparent bridge + ::before plate), fix
VIP cards hidden by wrong .navbar-vip.hover-show selector, keep CTA 34px.

assets/css/frontend/nav/base.css

@@ -538,6 +538,9 @@ body.nav-fixed .header.show-slide .navbar.navbar-top {
   display: flex;
   align-items: center;
   gap: 8px;
+  overflow: visible;
+  position: relative;
+  z-index: 25;
 }
 
 .scroll-down.nav-fixed .header.scroll-down-hide,