Convert the current stretching web app into a fully native iOS and Android app with all outlined functionalities and subscriptions. **Core App Features** • Home screen • Programs / exercise list • Workout player with timers and exercise transitions • Audio playback during workouts • User account screen • Settings screen • Paywall screen for locked content • Restore purchases options **Subscriptions (Required)** • Apple In-App Purchases (iOS) • Google Play Billing (Android) • Restore purchases functionality • Handling of active, expired, cancelled, and grace period states • Subscription entitlement gating inside the app • Server-side receipt validation with Apple & Google • Backend keeps subscription status synced via store notifications/webhooks **Backend** • Firebase (Auth + Firestore/DB) integration • User authentication and syncing progress • Subscription status storage with structure for exercises/programs • Proper server environment setup for security (no sensitive info in the code repo) **Offline Functionality** After first download/sync: • Cached and functional offline browsing/workouts (images, audio, user-progress syncing when back online) **Notifications / Reminders** Push notifications reminders systems added as updates using firebase-cloud!..Reminder software..tracking system native redesignations/Original absences-check routine manually atleast Organic triggers systematic.Timer percentages limitplacement!