This is a big update to the Review Dialog, adding dark mode support and

fixing up layout issues.
All the buttons have been replaced with Ink buttons. The Publish button

is now marked as Primary, adding a visual indicator to it. Likewise,

Discard is marked as Danger.
Rather than applying margins to various elements to control spacing, we

now use a flexbox for the parent containers for comments along with a

gap. Any empty containers are hidden from view, in order to avoid extra

spacing.
The orange header labels are now green, which stands out better in dark

mode and also better conveys a draft.

Tested all aspects and comment types in the Review Dialog in both light

and dark modes.
Tested all Publish options.
Tested discarding.
Tested adding a general comment within the dialog.
Tested closing.