Multiple issues observed in the Follow-Up module related to validation, field behavior, and default values:

1. Follow-Up Date Validation Missing:
   • No validation present for follow-up date.
   • System allows invalid or incorrect date selection.
2. Actual Treatment Completion Date Error:
   • Error is displayed on second click of submit button even when data is correct.
3. Validation Missing for Date of Death Field:
   • No validation applied on Date of Death field.
   • Incorrect or empty values are allowed.
4. Reason for Death Not Prefilled:
   • "Reason for Death" field is not auto-filled as "Tuberculosis" for TB beneficiaries as expected.
5. Submit Button Behavior Issue:
   • Submit button remains enabled even after completing follow-up.
   • It should be disabled once follow-up is submitted to prevent duplicate entries.

Steps to Reproduce:

1. Navigate to Follow-Up module.
2. Fill form with different combinations:
   • Leave date fields invalid/empty.
   • Submit form multiple times.
   • Check death-related fields.
3. Observe validation behavior and button state.

Expected Result:

• Proper validation should be applied on:
  • Follow-Up Date
  • Actual Treatment Completion Date
  • Date of Death
• "Reason for Death" should be auto-filled as "Tuberculosis" where applicable.
• Submit button should be disabled after successful submission.

Actual Result:

• Missing validations on key fields.
• Incorrect error behavior on second submit.
• Reason for Death not prefilled.
• Submit button remains active after submission.