### Overview
This PR updates the fulfillment label rendering by replacing the deprecated .url field with the new tracking_url and label_url fields, following the MedusaJS FulfillmentLabel model.
### Changes
- Implemented conditional rendering for both tracking_url and label_url.
- If a tracking_url exists, it is displayed as a clickable link.
- Similarly, if a label_url exists, it is displayed as a clickable link.
- If neither link is provided, only the tracking number is shown.
- Maintained existing styling for interactive elements.

### Reference
This update is based on the MedusaJS FulfillmentLabel model:
https://docs.medusajs.com/resources/references/fulfillment/models/FulfillmentLabel
Please review the changes and provide feedback for further improvements.
Co-authored-by: William Bouchard <46496014+willbouch@users.noreply.github.com>