Data Type Handling for Structure Inventory Import

I think we have some more work to do to handle different data types for structure inventory importing. It feels like we should be able to import a numerical attribute as a double or as an integer and recast as a double. 

<img width="403" height="172" alt="Image" src="https://github.com/user-attachments/assets/9a1b2eae-3ac8-4ba8-9402-63e6a0695afe" />