Fix editor switcher colour transition (#12328)

GitOrigin-RevId: fc8caa34b12b9ef35422766023cdebf4bd36ff75

services/web/frontend/stylesheets/app/editor/toolbar.less

@@ -251,7 +251,9 @@
   cursor: pointer;
   user-select: none;
   color: @text-color;
-  transition: color 0.12s ease-out;
+  border-radius: @btn-border-radius-base;
+  transition: color 0.12s ease-out, background-color 0.12s ease-out,
+    box-shadow 0.12s ease-out;
   overflow: hidden;
 
   span {