feat: add facet_titles kwarg to strip dim= prefix

[FBumann]

Summary

• New facet_titles keyword on every accessor/plotting method (xpx(da).line(facet_col=..., facet_titles="value")). Accepts:
  • "default" (default) — keep PX's "<dim>=<value>" subplot titles, no behavior change.
  • "value" — strip the <dim>= prefix, leaving just the value.
• New public helper simplify_facet_titles(fig, mode) for figures built outside the accessor (e.g. raw PX, overlay, add_secondary_y outputs).
• Shared Literal["value", "default"] alias FacetTitlesMode in xarray_plotly.common.

Defensive: only annotations whose text starts with a Python-identifier prefix followed by = are touched, so user-added annotations are preserved.

Test plan

• pytest tests/ — 152 passed (7 new tests for the helper + kwarg).
• mypy xarray_plotly tests — clean.
• Verified default behavior unchanged on every plot method (line, bar, area, scatter, fast_bar, box, imshow, pie) for both DataArrayPlotlyAccessor and DatasetPlotlyAccessor.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d23131cd-cb20-446a-82c7-02d1e831ab40

📥 Commits

Reviewing files that changed from the base of the PR and between c889e9a and 686e565.

📒 Files selected for processing (6)

• tests/test_figures.py
• xarray_plotly/__init__.py
• xarray_plotly/accessor.py
• xarray_plotly/common.py
• xarray_plotly/figures.py
• xarray_plotly/plotting.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/facet-titles

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[FBumann]

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