Error when downloading extracted data in Excel format

When attempting to download extracted data in Excel format, the following error occurs:

```
Traceback (most recent call last):
File "/app/.venv/lib/python3.12/site-packages/flask/app.py", line 1511, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/flask/app.py", line 919, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/flask/app.py", line 917, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/flask/app.py", line 902, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return
]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/excalibur/www/views.py", line 258, in download
zipfile = glob.glob(os.path.join(datapath, "*.zip"))[0]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^
```

Start at the download view in excalibur/www/views.py, around line 258, where the Excel download looks for a ZIP file with glob. Reproduce the extracted-data Excel download and trace why no matching ZIP is found; done means the download completes without the reported IndexError.

Written by the indexing model from the issue text.