feat(plotly): add per-chart locale support

[BABTUNA]

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

New Feature Submission:

• Does your submission pass the tests?
• Have you linted your code locally prior to submission?

Changes To Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Description

Adds first-pass Plotly locale support on
x.plotly and plotly dist variants via a new locale prop.

What changed:

• Added locale prop to Plotly.
• Added plotly.js-locales@3.5.0 dependency/import.
• Added locale helpers that resolve locale data and merge it into config (locale + locales) at render time.
• Kept locale handling internal to config (the raw locale prop is excluded from direct component props).
• Added unit coverage for both
  x.plotly(...) and
  x.plotly.basic(...) locale flow.
• Added docs section showing localized usage.
• Updated pyi_hashes.json for packages/reflex-components-plotly/src/reflex_components_plotly/plotly.pyi.

Validation:

• uv run --no-sync ruff check packages/reflex-components-plotly/src/reflex_components_plotly/plotly.py tests/units/components/graphing/test_plotly.py
• uv run --no-sync pytest tests/units/components/graphing/test_plotly.py -q
• uv run --no-sync pytest tests/units/components/graphing -q

Closes #6101

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 8 skipped benchmarks¹

---

_{Comparing BABTUNA:feat-6101-plotly-locale (dbf10d2) with main (474f5b6)}

Footnotes

1. 8 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. ↩

[greptile-apps]

Greptile Summary

This PR adds per-chart locale support to rx.plotly (and all dist variants) via a new locale prop. The locale prop is excluded from direct React props and instead wrapped into the Plotly config at render time using JS helper functions, following the conditional-import pattern from moment.py.

• New locale: Var[str] prop on the Plotly base class; excluded from direct props via _exclude_props; emits plotly.js-locales@3.5.0 import and JS locale helpers (_rxResolvePlotlyLocaleData, _rxGetPlotlyLocaleConfig) only when the prop is set, keeping zero cost for charts that don't use locale.
• _render wraps the effective config through _rxGetPlotlyLocaleConfig, resolving locale data from the bundled locale dictionary and merging it with any user-supplied config (including state-driven configs).
• Unit tests verify the render shape and the helper name appears in the config expression; integration tests (Playwright) confirm modebar tooltips are localized and that state-driven configs are preserved when a locale is merged.

Confidence Score: 5/5

Safe to merge — the locale prop is correctly gated, zero-cost for charts without it, and the render path handles both static and state-driven configs without regressions.

The conditional import and custom-code pattern mirrors moment.py correctly. The Reflex framework's _iter_parent_classes_with_method calls every distinct add_imports override in the MRO chain independently, so the plotlyLocales import is automatically included for all dist variants when locale is set — no super() calls required. _render correctly overwrites the config prop with the locale-wrapped expression, and locale is properly excluded from direct React props. Unit and integration tests cover the expected render shape and end-to-end localization behaviour.

No files require special attention.

Important Files Changed

Filename	Overview
packages/reflex-components-plotly/src/reflex_components_plotly/plotly.py	Core implementation: adds conditional locale import and helpers; _render correctly wraps config; _exclude_props updated; dist-variant subclasses do not need to call super().add_imports() — the Reflex framework invokes each unique add_imports in the MRO chain independently.
tests/units/components/graphing/test_plotly.py	Adds unit tests for locale render output for both rx.plotly and rx.plotly.basic; verifies _rxGetPlotlyLocaleConfig in config prop and that locale is excluded from direct props.
tests/integration/tests_playwright/test_plotly.py	New integration test: verifies localized modebar titles for de/fr locales and that locale merges cleanly with a state-driven config without dropping config options.
docs/library/graphing/other-charts/plotly.md	Adds a short Locale Configuration section with a runnable demo exec example and a note about mixing locale= with config=.
pyi_hashes.json	Updated .pyi hash for the plotly package to reflect the new locale prop.

_{Reviews (4): Last reviewed commit: "add integration test for plotly charts w..." | Re-trigger Greptile}