Implemented null/undefined handling throughout NavigationController
and useNavigationFlow hook to prevent crashes from invalid data:
- Added null checks for all profile and beneficiary parameters
- Validated beneficiary IDs before navigation (type and value checks)
- Added fallback routes when data is invalid or missing
- Implemented safe navigation with error handling and logging
- Added defensive guards for optional purchaseResult parameter
Key improvements:
- getRouteAfterLogin: handles null profile, null beneficiaries, invalid IDs
- getRouteForBeneficiarySetup: validates beneficiary exists before routing
- getRouteAfterAddBeneficiary: validates beneficiary ID type and value
- getRouteAfterPurchase: handles null purchaseResult safely
- getBeneficiaryRoute: returns fallback route for invalid beneficiaries
- navigate hook: wraps router calls in try-catch with validation
All methods now gracefully handle edge cases without crashing,
logging warnings for debugging while maintaining UX flow.
Tests included for all null/undefined scenarios.
