Some quick feedback: changing pages (eg: navigating from 'new' to 'inspiration', 'sources', etc...) while in night mode switches the user back to day mode, which can be quite jarring.
If you go to 'Manage sources' and set the default theme to dark - it will work for both 'News' and 'Inspiration'. But yeah dark mode everywhere (even in manage sources) is something we need to work on.