- Add NotificationPreferencesScreen (Android) and NotificationPreferencesView (iOS)
- Add NotificationPreferencesViewModel for shared business logic
- Wire up notification preferences from ProfileScreen on both platforms
- Add subscription verification on app launch for iOS (StoreKit) and Android (Google Play Billing)
- Update SubscriptionApi to match Go backend endpoints (/subscription/purchase/)
- Update StoreKit Configuration with correct product IDs and pricing ($2.99/month, $27.99/year)
- Update Android placeholder prices to match App Store pricing
- Fix NotificationPreference model to match Go backend schema
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Co-Authored-By: Claude <noreply@anthropic.com>
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