feat: Auto-redirect to Assign Doctor after Patient Registration

Description

Currently, after a volunteer successfully registers a new patient, the application redirects back to the landing page. To assign a doctor, the volunteer must manually navigate to the Assign Doctor page and search for the newly created patient again. This extra step disrupts the workflow, especially during high-volume registration periods.

This feature improves the registration flow by automatically redirecting the volunteer to the Assign Doctor page immediately after a new patient is created.

User Story

As a volunteer, I want to be automatically redirected to the Assign Doctor screen after registering a new patient so that I can immediately assign the patient to a doctor without additional navigation.

Acceptance Criteria

• Trigger: The redirect occurs only after a successful Create & Register Patient action. It should not trigger when updating existing patient records unless explicitly required.
• Feedback: A success notification (e.g., “Patient created successfully. Redirecting…”) is displayed before the redirect.
• Action: The application navigates to /volunteer/assign-doctor/{book_no}.
• State: The Assign Doctor page loads with the newly created patient’s Book Number pre-filled or automatically selected.

Technical Notes

• Updated PatientRegistrationPage.tsx.
• Modified the createPatientMutation onSuccess handler.
• Added navigation to /volunteer/assign-doctor/${data.book_no}.
• Introduced a short delay (~1000 ms) to allow the success toast to be visible before redirecting.