ubuntu-latest is moving to Ubuntu 26.04, and runners on the new image
restored the 24.04 WebKit build from the cache. It couldn't find
libicudata.so.74 and failed to launch, so the visual tests failed
without any visual diffs.
Extracts the avatar components and the style tokens into shared/ui, which
both apps consume as a workspace package, to try out ADR 2. Nix and the
Docker setups are not updated yet.
Desktop's GitHub workflows are already prefixed `desktop-`. With both
projects in one repo, the prefix shows which project a workflow or
Buildkite step belongs to.