fix(pipx): combine --pip-args value to avoid argparse error

[fru1tworld]

Summary

pipx's argparse rejected --pip-args --uploaded-prior-to=... because the value starts with --. Pack into a single --pip-args=VALUE element. Regression from #9190.

Closes #9976

[greptile-apps]

Greptile Summary

Fixes a regression (#9190) where --pip-args --uploaded-prior-to=... was passed as two separate argv elements, causing pipx's argparse to misinterpret the value as a new flag because it starts with --. The fix collapses them into a single --pip-args=VALUE form.

• The pip_uploaded_prior_to_args helper now returns a single --pip-args=--uploaded-prior-to={date} element instead of two separate elements.
• The corresponding unit test was updated to reflect the new expected output, with a comment explaining the rationale.

Confidence Score: 5/5

Minimal, targeted fix with a matching test update — safe to merge.

The change is a single-function, single-file edit that corrects an argparse parsing failure. The logic is straightforward, the test is updated to match, and no other callers are affected.

No files require special attention.

Important Files Changed

Filename	Overview
src/backend/pipx.rs	Combines --pip-args and its value into a single --pip-args=VALUE argv element so pipx's argparse doesn't misinterpret the leading -- as a new flag; unit test updated accordingly.

_{Reviews (1): Last reviewed commit: "fix(pipx): combine --pip-args value to a..." | Re-trigger Greptile}

[gemini-code-assist]

Code Review

This pull request updates the PIPXBackend to combine the --pip-args flag and its value into a single argument string. This change ensures that pipx correctly parses the value without misinterpreting its leading dashes as separate flags. The corresponding test case has been updated to reflect this change and includes a comment explaining the rationale. I have no feedback to provide as there were no review comments.

[github-actions]

This PR has had failing checks for more than 7 days. Feel free to reopen or create a new PR if you'd like to continue working on this.