feat(muix): implement heatmap-polar (#12357)

## Implementation: `heatmap-polar` - javascript/muix

Implements the **javascript/muix** version of `heatmap-polar`.

**File:** `plots/heatmap-polar/implementations/javascript/muix.tsx`

**Generation:** adopted from `5b2bcb3e5e4dc5b3685a669c07cf3ab1b9918f69`
(5b2bcb3) by gemini-4-argon; the model
below runs repair

**Model:** opus

**Parent Issue:** #5244

**Regeneration:** previous quality 89 (forced: adopted from
5b2bcb3, fresh-generation review path)

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:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/40082794039)*

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>

Author: 3 people