Most of the pages are able to pick up my system dark mode, but there is no support for that in the packager dashboard. I know there are various browser plugins that could do that, but native support is always cleaner.
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/apps/packager_dashboard/issues/190
Please continue any further discussion there.
Metadata Update from @kparal: - Issue status updated to: Closed (was: Open)