add comprehensive unit tests for NotificationContext and PatientRegistrationPage

Added comprehensive unit test cases:

• NotificationContext.tsx
• PatientRegistrationPage.tsx

NotificationContext

• Added tests for Provider rendering
• Covered showNotification and hide/clear logic
• Tested default context behavior
• Covered hook usage validation
• Tested error case when used outside Provider (if applicable)

PatientRegistrationPage

• Covered successful registration flow
• Covered mutation error handling
• Covered loading and disabled states
• Covered edit mode behavior
• Covered conditional rendering branches
• Covered edge API response scenarios
• Mocked navigation behavior
• Covered alternate UI paths and fallback rendering

Before

After