Fix psmeca failure when P and T axes have equal dips

[Chuan1937]

I tried again, however, unlike before, I was able to download the dvc files during this local test, so I used the results from the master branch for the test.

Fixes #8009

[Copilot]

Pull request overview

This PR fixes a bug in the psmeca module where the function failed when the P (pressure) and T (tension) axes have equal dips. The fix modifies the logic in the meca_axe2dc function to properly handle the edge case of equal dips while excluding the strike-slip fault case.

Key changes:

• Enhanced conditional logic to detect when P and T axes have equal dips (within tolerance)
• Added special handling to exclude strike-slip faults where both dips are near zero
• Added explanatory comments documenting the logic

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[joa-quim]

CI continue a incomprehensible disaster. Run the tests locally and and all seem fine. Two points though:

• We use C comments, not C++ (Copilot invention)
• What about a new test for this case?

[seisman]

Looks good. Could you please add a test for it?

[Chuan1937]

CI continue a incomprehensible disaster. Run the tests locally and and all seem fine. Two points though:

• We use C comments, not C++ (Copilot invention)
• What about a new test for this case?

Ok,I'll be careful next time.

[Chuan1937]

Looks good. Could you please add a test for it?

I'll try to add one if I can

[joa-quim]

Ok,I'll be careful next time.

You can still change it for this time. It's just replace the \\ by /* */

[seisman]

Could you please also add the focal mechanisms in #8009 into the test?