Positron Web: New Project Wizard does not work

[testlabauto]

System details:

Positron and OS details:

Main on Sep 27, 24

Interpreter details:

Python 3.10.12
R 4.3.3

Describe the issue:

I think there are multiple issues, but the first is the fact that filesystem "awareness" seems to be problematic:

Steps to reproduce the issue:

1. Open Positron
2. Start New Project Wizard with R or Python

Expected or desired behavior:

Able to proceed in wizard process.

Were there any error messages in the UI, Output panel, or Developer Tools console?

No

[juliasilge]

Related to #4800