FEniCS / ffcx / 33216942315

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Expose cancelling of J@K from UFL (#858)

* Expose option from https://github.com/FEniCS/ufl/pull/496
to check that we get the same matrices for a div-div operator on RT. For higher order elements this really matters.

* Typing

* Hardcode tolerance for now and remove trailing code

* Increase single precision tolerance

* Enable Jacobian product cancellation by default

* Default Jacobian cancellation in analysis

* Mark complex-dtype tests xfail on win32 in test_cancel_jacobians.py

MSVC lacks C99 _Complex support, matching the existing xfail pattern
used in test_add_mode.py and test_jit_forms.py.

* Retry basix wheel build on Windows CI to work around transient file-lock error

scikit-build-core intermittently hits a PermissionError while cleaning up
its temp build directory on Windows runners (a file briefly held by
another process), which fails the pip install even though the wheel
itself built successfully. Retry the install a few times to ride out
the flake.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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Co-authored-by: Garth N. Wells <gnw20@cam.ac.uk>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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