# 28. Implement Android settings/preferences store

meta:
  id: native-business-logic-migration-28
  feature: native-business-logic-migration
  priority: P1
  depends_on: [native-business-logic-migration-16]
  tags: [implementation, android, settings]

objective:
- Implement settings store using DataStore and SharedPreferences

deliverables:
- SettingsStore.kt
- AppSettings.kt
- ReadingPreferences.kt
- NotificationPreferences.kt
- Settings migration

tests:
- Unit: Test property storage/retrieval
- Unit: Test defaults
- Unit: Test synchronization

acceptance_criteria:
- All settings persisted
- Defaults properly set
- Changes observed in real-time
- Preferences encrypted if needed
- Settings migrated between versions

validation:
- Run `./gradlew test`
- Test with Application Info > Preferences

notes:
- Use DataStore for new code
- Use SharedPreferences for simple values
- Observe changes with Flow