dcdpr / jp / 26126259533

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enhance(workspace): Add `XDG_DATA_HOME` and `JP_USER_DATA_DIR` support (#660)

`user_data_dir()` previously resolved only via the platform default
(`directories::ProjectDirs::data_local_dir`). On macOS this lands under
`~/Library/Application Support`, which is invisible to users running JP
alongside other XDG-aware tools.

Resolution order is now:

1. `JP_USER_DATA_DIR` if set — used verbatim, no suffix appended.
Primarily useful for testing and CI, but also lets power users pin the
data directory to an explicit path.
2. `$XDG_DATA_HOME/jp` if `XDG_DATA_HOME` is set to an absolute path.
Honored on all platforms. Empty or relative values are treated as unset,
in line with the XDG Base Directory Specification.
3. The platform default as before.

The CLI integration tests now set `JP_USER_DATA_DIR` to a temp directory
so they no longer touch the real user data directory.

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Signed-off-by: Jean Mertz <git@jeanmertz.com>

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