Supplier Wizard Improvements:
- Added 'Días de Entrega' (Lead Time Days) field - CRITICAL field
- Field shows as required with asterisk and helper text
- Validates that lead time is provided before allowing continue
- Made 'Términos de Pago' optional (not critical info)
- Added empty option 'Seleccionar...' to payment terms dropdown
- Updated API call to include lead_time_days parameter
- Payment terms now sends undefined if not selected
- Lead time days properly parsed as integer before sending to API
These changes ensure critical logistics information is captured while
making optional business terms more flexible.
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