Doctor Desktop

In the Prescription tab, the "Duration (days)" field has no required asterisk, but adding a line without it is rejected with "Enter the number of days for this medicine". Drug name and Dosage show a red asterisk; Duration does not.

Steps to Reproduce:

1. Open a consultation (e.g. /doctor/consultation/399, patient amal prasad, MRN VVMC-000118) and go to the Prescription tab.
2. Enter Drug name = Dolo 120mg 60ml Syp and a Dosage; leave Duration (days) empty.
3. Click Add line.

Expected Result: Duration (days) is visibly marked as required (asterisk) like Drug name and Dosage, so the doctor knows before submitting.

Actual Result: Duration (days) shows no required marker (placeholder "e.g. 7" only). The line is rejected with the toast "Enter the number of days for this medicine".

Notes:

• Validation is in opd/app/(app)/consultation/[visitId]/page.tsx (duration must parse to > 0); the label is in _rx-tab.tsx ("Duration (days)", no asterisk). This is OPD's shared consultation code, so the fix likely belongs in nuvita-opd and reaches Doctor Desktop on the next sync.
• Same screen: the Drug name/Dosage toast says "Drug name and dosage are required", so Duration is the only required field without a marker.