Feature request: Retain original filename after folder upload/download

**Is your feature request related to a problem? Please describe.**
When downloading files after doing a folder upload, the original filename is replaced with a number representing the order in which it was uploaded.
**Describe the solution you'd like**
Keep the original filename.

**Describe alternatives you've considered**
Manual manipulation

**Additional context**
Add any other context or screenshots about the feature request here.
Contents of uploaded folder:

After download:

Start by tracing CyberChef’s folder upload and download flows, focusing on where uploaded files are assigned names and where downloaded files are generated. Confirm the behavior with a folder containing multiple files; done means downloads retain each file’s original filename instead of its upload-order number.

Written by the indexing model from the issue text.