fix(files): CustomElementRender $el replacement bug

[skjnldsv]

Context

Initially, I was trying to not wrap whatever is given to the CustomElementRender. But that means we have to update the $el reference.
Vue does not like this and lose reference when multiple updates are being done. We should avoid this, so I fallback to replacing the children and we just wrap into a span 🤷

Done

• Fixed CustomElementRender
• Make sure we don't run the render function of the systemTag action if there is none
• Also fixed the border contrast on hover so it's still visible
  

[skjnldsv]

/compile amend /