No features. Nothing in the app changed.
0.10.8 could not be built by anyone who did not already have this repository's private files, which is everyone. Two reasons: without a local.properties the generated BuildConfig came out malformed and nothing compiled, and without a signing key the build ran all the way to packaging and stopped there. Both are fixed, and the project now targets Java 21, which is what the release builds were already running on.
This is a pre-release on purpose. If you are on 0.10.8 there is nothing here for you, and the in-app updater will not offer it.