Goal

Fix the broken navigation tree and ensure the app follows the "file-based routing" standard.

Instructions

1. •Layout Integrity:
   • •Ensure app/_layout.tsx has a proper default export.
   • •Implement the Slot or Stack provider.
2. •Navigation Upgrade:
   • •Identify legacy navigation.navigate() calls.
   • •Replace with router.push() or router.replace() from expo-router.
3. •Modularization:
   • •Move business logic (API calls, data fetching) out of app/(tabs) and into src/services or src/hooks.
4. •Tab Cleanup: Remove the "Wallet" tab from app/(tabs)/_layout.tsx.

Constraints

• •No useEffect for navigation if a Link component can be used instead.
• •All routes must be strictly typed.