What changed
- Fixed failing preview builds. An empty
DATA_SOURCEsetting (a dashboard variable created without a value) now falls back to the JSON files instead of failing the build. - Node 24 everywhere, so Vercel builds with the same version as the automated checks.
- Documented the pre-release site. The public preview at college-stats-nine.vercel.app reads the development database; setting up a separate production database is left for the formal release.