web: Safari fixes merge branch (#14181)

* web/admin: Fix layout centering. Adjust theming.

* web: Fix issue where references to Lit SSR break page styles.

* web: Fix issues surrounding color scheme/theme mixup in UI.

web/src/common/styles/authentik.css

@@ -17,6 +17,13 @@
 
     /* Minimum width after which the sidebar becomes automatic */
     --ak-sidebar--minimum-auto-width: 80rem;
+
+    /**
+     * The height of the navbar and branded sidebar.
+     * @todo This shouldn't be necessary. The sidebar can instead use a grid layout
+     * ensuring they share the same height.
+     */
+    --ak-navbar--height: 7rem;
 }
 
 @supports selector(::-webkit-scrollbar) {