Avoid overflow when symmetrizing ellipse matrices

[FlorianPfaff]

Summary

• avoid intermediate overflow in the shared ellipse-geometry symmetrization helper
• add a focused float32 regression test that treats overflow/invalid warnings as errors

Bug

0.5 * (matrix + matrix.T) adds the two full-magnitude operands before scaling. For finite float32 entries near finfo.max, that intermediate addition overflows to infinity even when the symmetric average is exactly representable.

Fix

Scale each operand before adding: 0.5 * matrix + 0.5 * matrix.T.

Validation

• reproduced the old failure with a float32 matrix filled with np.finfo(np.float32).max
• verified the revised expression returns the unchanged finite matrix under np.errstate(over="raise", invalid="raise")
• added tests/tracking/test_ellipse_geometry_symmetrization_overflow.py

[github-actions]

✅MegaLinter analysis: Success

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[FlorianPfaff]

Closing as an exact duplicate of #5178. Both replace 0.5 * (matrix + matrix.T) with 0.5 * matrix + 0.5 * matrix.T; #5178 is the earlier PR and already carries equivalent regression coverage.