Remove unused _pow10_label helper from pyplot axes

[aymuos15]

_pow10_label in python/xy/pyplot/_axes.py was a one-line wrapper over _pow_label(value, 10.0) with no call sites anywhere in python/, tests/, scripts/, js/, or docs/.

Axes._apply_tickers already calls _pow_label directly with the base pulled from the tick spec (_pow_label(value, float(spec.get("base", 10.0)))), so the hardcoded-base wrapper had been superseded.

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed the module-level _pow10_label base-10 wrapper from python/xy/pyplot/_axes.py, leaving the generic _pow_label(value, base) implementation.

Changes

Axes label helper cleanup

Layer / File(s)	Summary
Remove base-10 label wrapper python/xy/pyplot/_axes.py	Deletes _pow10_label, leaving callers to use the generic _pow_label implementation.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: removing the unused _pow10_label helper from pyplot axes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codspeed-hq]

Merging this PR will not alter performance

✅ 103 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing aymuos15:worktree-dead-code-python (02035fc) with main (2d66c51)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[aymuos15]

Seems to be another flaky case.