Include days after planting on trial details page

Age (DAP): If this could calculate days from given plant/harvest dates to display the age of the trial. Once data collection is marked as complete, this can be marked as “finished”. 

<img width="1061" height="749" alt="Image" src="https://github.com/user-attachments/assets/3dbf86e6-cf15-4b96-b8f0-9d72615777e4" />