Improving 'cheatsheet' / Variable UI panel within Bricks builder#80

Love the small Variable UI panel that pops up in the builder by pressing cmd + value field.

However, it would be great to see the following improvements:

• px or rem size should be visible when hovering - together with the variable name
• there should be a panel button at the top nav near the dark theme toggle (preferably with a choice to turn it on in CF settings)