The in-app language picker silently did nothing: AppCompatDelegate.set
ApplicationLocales only syncs to the system from an AppCompatActivity, but
MainActivity was a plain ComponentActivity (with a platform theme). Switch
MainActivity to AppCompatActivity and base Theme.Calendula on
Theme.AppCompat.DayNight.NoActionBar.
Changing the locale recreates the activity; set android:windowBackground to a
DayNight colour matching the Compose background (light #FBFCFE / dark #101316)
so the recreation no longer flashes a contrasting backdrop.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
READ_CALENDAR permission declared. Strings split into English master
(values/) and German (values-de/) with the Loading/Failure/Success
generic state strings used across screens. Backup rules let DataStore
back up by default with no file-based content. Theme stub delegates
real theming to Compose; the Activity-level XML theme only sets
transparent system bars and dark-mode hint.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
