Stable release of Chromium 102 has fixed dark mode support for SVG favicons:
grapheneos.org
Nice to have that working again.
Ported over the icon configuration to discuss.grapheneos.org so that part of setting up the theme for our discussion forum is completed now.
Conversation
Dark mode support for the discussion forum itself is going to require either adding a Flarum extension or waiting for Flarum itself to support dynamically switching the theme. We're holding off on adding extensions and will be careful to only use trustworthy well maintained ones.
Replying to
fyi any fof (Friends of Flarum) extension is well maintained. Flarum core developers and team members are involved with this community project.
2

