Merge pull request #29443 from overleaf/mj-mobile-navbar-bg

[web] Restore transparent background for hamburger navbar items on mobile

GitOrigin-RevId: ce3a095ded307427f2175d7db2a562c106e4b2e9

services/web/frontend/stylesheets/components/navbar.scss

@@ -203,6 +203,7 @@
           .dropdown-item {
             padding: var(--spacing-02) var(--spacing-06) var(--spacing-02)
               var(--spacing-08);
+            background-color: transparent;
 
             &:not(.disabled) {
               color: var(--navbar-hamburger-submenu-item-color);