More gracefully fail on `pyproject.toml` error

[eleanorjboyd]

tried going through the "create environment..." flow with a pyproject.toml file but I had an error since my pyproject.toml file was incorrectly formatted. Would be good if the error message was better or it failed more gracefully

 Resolved Python Environment /Users/eleanorboyd/python-envs-scenarios/existing-env-folder/.venv/bin/python
2025-05-14 09:19:39.308 [info] Running: uv pip install --python /Users/eleanorboyd/python-envs-scenarios/existing-env-folder/.venv/bin/python -e /Users/eleanorboyd/python-envs-scenarios/existing-env-folder
2025-05-14 09:19:39.378 [info] error: Failed to extract static metadata from `pyproject.toml`
  Caused by: TOML parse error at line 6, column 8
  |
6 | name = "existing env folder"
  |        ^^^^^^^^^^^^^^^^^^^^^
Not a valid package or extra name: "existing env folder". Names must start and end with a letter or digit and may only contain -, _, ., and alphanumeric characters.