* Move isMobileViewport to a helper function in lib
* Switch SummaryList to use navigable menu to support up/down (or left/right) arrow key navigation
* Switch to a dropdown menu/button combo when on a smaller screen
* Ensure aria role & href are only added if the item is a link
* Wrap the entire SummaryNumber in a link to match non-mobile use
* Update card content to be single line on mobile
* Add label to the popover title
* Make SummaryNumbers edge-to-edge on smaller screens
* Switch to the collapsed/dropdown view on screens <1100px
* Adjust offset of arrow icon
Kelly Dwan
Paul Sealock
Justin Shreve