fix: urls.primaryName functionality regression (via #5097)

* add tests

* compute index before triggering URL load

* bonus: improve urls topbar label

src/style/_topbar.scss

@@ -54,6 +54,7 @@
             width: 100%;
             max-width: 600px;
             margin: 0;
+            color: #f0f0f0;
             span
             {
                 font-size: 16px;