Fix bar tick labels for xarray DataArray with string coordinate

[kinyatoride]

Summary

ax.bar(da) on a 1-D xarray.DataArray with a string coordinate renders the full multi-line xarray repr as each x-tick label instead of the underlying string values.

Reproducer

import xarray as xr
import ultraplot as uplt

gm = xr.DataArray(
    [1.0, 2.0, 3.0],
    coords={"ens": ["A", "B", "C"]},
    dims=["ens"],
    name="pr",
    attrs={"long_name": "precipitation", "units": "mm/day"},
)

fig, ax = uplt.subplots(refwidth=4)
ax.bar(gm)
print([t.get_text() for t in ax.get_xticklabels()])

Before: each tick label is "<xarray.DataArray 'ens' ()> Size: 4B\narray('A', dtype='<U1')\nCoordinates:\n ens <U1 4B 'A'" (and similarly for 'B', 'C').

After: ['A', 'B', 'C'].

Cause

In ultraplot/internals/inputs.py::_meta_coords, labels = list(map(str, data)) did not unwrap the xarray.DataArray first. _parse_1d_format passes the coordinate through as a DataArray (not a numpy array); iterating a 1-D DataArray yields scalar DataArrays whose str() is the multi-line repr.

Fix

Wrap data with _to_numpy_array (already defined in the same file) before stringifying, so iteration yields the raw element values for both xarray.DataArray and pandas inputs.

Test

Added test_meta_coords_xarray_string_coord in ultraplot/tests/test_inputs_helpers.py (skipped if xarray is not installed).

Confirmed broken on 2.2.0; fix verified locally with pytest ultraplot/tests/test_inputs_helpers.py and an end-to-end ax.bar(xr.DataArray) smoke check.

[cvanelteren]

I will fix the zenodo stuff; it's not related to this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[cvanelteren]

Error will fix itself. Thanks @kinyatoride