better integrate calls into the system via 'Build a calling app'¹

a few hooks like onAnswer/onReject and automatic PhoneAccount creation are still missing

¹: https://developer.android.com/develop/connectivity/telecom/selfManaged

this might have bad interactions with legacy storage

this is just a beta release to test the Google Play policies wrt Android 14

fastlane changelog version codes now use the highest version code after abi split (the F-Droid website displays that one)

Which actually validates according to spec instead of just being lazy.