Add a folder structure to organize Library Items

Problem:
User's library is so full, it's difficult for them to find the correct cabinet. They can use the search function, but it requires knowing the exact name of the cabinet.

Suggestion:
Create a folder structure within the MaxCut library. For example:

Cabinets (Root Folder/Group)

Floor Cabinets (Sub Folder/Category)
-- Floor 300 (Library Item)
-- Floor 450 w/ drawers (Library Item)
-- ...

This feature could improve organisation and efficiency for customers with extensive libraries, making it easier to navigate and find specific items without relying solely on the search function.

Requested by DDK Interieur (16723)