The dashboard is quite information-dense, with a lot of information

running together.
In an attempt to give that information more breathing room, this change

adds some additional padding to the header, cells, and paginator, taking

spacing from 4px in the header, 5px in the cells, and 0.7em in the

footer to 0.75em across the board. (Technically, the header is now

0.75em horizontal, 0.5em vertical).
This makes it just a bit easier to focus on individual review request

summaries (particularly when they're very long), and better promotes the

most recent review requests.
There's no longer a border between rows, cutting back that bit of visual

excess.
There's also a fix for the styling of the age datetime borders. The

top-most one always had a top border, which looked bad. The top-most one

is now flush against the header.

Tested the dashboard and other datagrid pages, comparing between the old

and new styles.
Initially, it felt like perhaps too much whitespace, but it quickly felt

far easier to read and digest the information.