What's new modal and GitHub pre-release notes
Adds a one-time What's new modal and surfaces dev-track notes from GitHub pre-releases.
Features
Show a one-time What's new modal after each release, fed by logg.sh changelog entries.
Users see new changes in-app once per release instead of hunting through notes, using the same changelog content logg.sh produces.
Publish and consume dev-track release notes from GitHub pre-releases.