Use “Download File” instead of “Download ZIP” for single-file datasets

[ChengShi-1]

For datasets containing only one downloadable file, the Access Dataset menu currently displays Original Format ZIP. However, downloading a single-file dataset should not require creating a ZIP archive. Instead, the frontend should download the file directly using the single-file download API and update the menu text to Download File. Also, for the use case we used, should change to a single-file download.

Expected behavior
When the dataset contains exactly one downloadable file:

• The menu option should display “Download File.”
• Clicking it should use the single-file download API.
• The file should be downloaded directly rather than packaged in a ZIP archive.

[lntutor]

I’ll work on this. I plan to preserve both formats for a single tabular file, route them through the single-file download API, label the original action “Download File,” remove the ZIP wording from the archival action, and keep multi-file behavior unchanged.