Incorrect behaviour with pixi add --feature --pypi

[vigneshmanick]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

pixi add --feature test --pypi ruff
pixi add --feature test ruff

Issue description

the commands above will result in the following changes to pixi.toml

[feature.test.dependencies]
ruff = ">=0.3.5,<0.4"

[pypi-dependencies] # <- Incorrect since this is the wrong feature
ruff = "*"  

Adding a pypi dependency via cli places it incorrectly into the default feature instead of the specified feature. The same works correctly when adding without the --pypi argument.

Also the version strings are different between the pypi and conda-forge variant. While the conda forge variant has the version range in the specification (">=0.3.5,<0.4") the pypi variant has no modifier and is set to "*"

NOTE: Adding the dependency manually by editing the pixi.toml file works correctly.

Expected behavior

[feature.test.pypi-dependencies]
ruff = ">=0.3.5,<0.4"  

[feature.test.dependencies]
ruff = ">=0.3.5,<0.4"

[ruben-arts]

This is a missed implementation! Good find.