`pyodide venv` doesn't work with a `uv`-managed Python installation on macOS due to a space in "Application Support" (`platformdirs.user_data_dir`)

[agriyakhetarpal]

To reproduce:

# install a uv-managed Python 
uv python install 3.14

# create venv from that Python
uvx --python 3.14 --from pyodide-cli --with pyodide-build pyodide venv .venv-pyodide

# activate it
source .venv-pyodide/bin/activate

# try to use it
pip install numpy

This reports:

env: Support/uv/python/cpython-3.14-macos-aarch64-none: No such file or directory

I guess we tripped up at Application Support, i.e., platformdirs.user_data_dir, since that folder contains a space.

[ryanking13]

Ugh, maybe we need some escaping?