Make the "open in wallet" link into its own button

[knguyenBC]

Issue

When using the showcase on a mobile device, the link to "open in wallet" is very insignificant considering it's a very important button to move forward the flow.

Suggestion

Increase the significance of the link by turning it into into a button. Ensure there's enough space from the "back" and "next" buttons to avoid mis-taps.