BUG: Fix concat dtype preservation through concat#61893

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adrienpacifico wants to merge 9 commits intopandas-dev:mainfrom

adrienpacifico:concat_categorical

Commits on Jul 17, 2025

add tests
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BUG: Fix #51362 special handling for categorical arrays in concat_compat
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run pre-commit and solves issues
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- correct test
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BUG: Improve categorical handling in concat_compat to respect tests, correct wrong tests
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Merge branch 'pandas-dev:main' into concat_categorical
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- change test from numpy to categorical_equal assertion
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modify test to respect : An empty categorical, and a categorical should concat as a categorical.
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- update tests for categorical values
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