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>
Jean-Luc Makiola
bab6fd175a