Fix the vertical navbar submenu painting over the footer dropdown (#3262)

.changeset/navbar-footer-dropdown-overlap.md

@@ -0,0 +1,5 @@
+---
+"@tabler/core": patch
+---
+
+Fixed the vertical navbar submenu painting over the `.navbar-footer` user dropdown.

core/scss/layout/_navbar.scss

@@ -112,6 +112,7 @@
 
     .dropdown-menu {
       position: static;
+      z-index: auto;
       min-width: 0;
       padding: 0;
       margin: 0;
@@ -261,6 +262,7 @@
       position: absolute;
       inset-inline-start: 100%;
       top: 0;
+      z-index: $zindex-fixed;
       min-width: var(--dropdown-min-width);
       padding: var(--dropdown-padding-y) var(--dropdown-padding-x);
       margin: 0;