BUG clarify DataTree constructor error for mappings - #11515
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Fixes #11514
DataTreeacceptsDataset,Coordinates, orNone, but itsTypeErrortext incorrectly saysdictis accepted. Update the message to listCoordinatesand add regression coverage for a mapping input.Testing:
uv run --no-project --python 3.13 --with pytest --with numpy --with pandas --with packaging --with hypothesis python -m pytest -q -o addopts= xarray/tests/test_datatree.py -k "test_create_with_data"Prepared with AI assistance; maintainer review is requested.