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.

🤖 Generated with Claude Code

[coderabbitai]

Warning

Rate limit exceeded

@FBumann has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 7 minutes and 29 seconds before requesting another review.

You’ve run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After the wait time has elapsed, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 71046951-c60d-42b7-8bcb-89d2080b2aef

📥 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

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}