Latency of adding JH only class to the DOM element

Background

For now, every time after our app loaded, we add a JH only HTML class to the content wrapper element after 1 second later, but this is rather something we don't want to see because some feature might not be available after initially loaded. This could cause the app shaking to the users

Proposal

We can add the wrapper class name in our Ruby template so that we will not have any latency.