Add chart theme tokens and docs

[geoquant]

Summary

• add kumo-chart-* theme tokens for chart palettes and chart UI colors
• update chart components to consume theme-config-backed colors instead of hardcoded literals
• document the new chart tokens on /colors
• fix docs token sourcing in dev so the Colors token reference reflects the source config
• fix the Tabs demo anchor accessibility lint issue

Testing

• pnpm --filter @cloudflare/kumo codegen:themes
• pnpm --filter @cloudflare/kumo typecheck
• pnpm --filter @cloudflare/kumo lint
• pnpm --filter @cloudflare/kumo-docs-astro lint (branch-specific oxlint errors fixed; remaining astro color-template failures are pre-existing elsewhere in the docs package)
• verified http://localhost:4321/colors renders the new chart token docs and CSS vars locally

Notes

• includes a changeset for @cloudflare/kumo

[pkg-pr-new]

npm i https://pkg.pr.new/@cloudflare/kumo@250

commit: df8cc03

[github-actions]

Docs Preview

View docs preview

Commit: df8cc03

[github-actions]

Visual Regression Report

4 screenshot(s) with visual changes:

Button / Loading State

6 px (0%) changed

Before	After	Diff

Dialog / Basic Dialog

128,213 px (2.45%) changed

Before	After	Diff

Select / Loading

0 px (0%) changed

Before	After	Diff

Select (Open)

0 px (0%) changed

Before	After	Diff

23 screenshot(s) unchanged

• Button / Variants
• Button / Sizes
• Button / With Icon
• Button / Icon Only
• Button / Disabled State
• Dialog / Alert Dialog (role="alertdialog")
• Dialog / Confirmation Dialog (with disablePointerDismissal)
• Dialog / With Actions
• Dialog / With Select
• Dialog / With Combobox
• Dialog / With Dropdown
• Dialog (Open)
• Select / Basic Usage
• Select / Without Visible Label
• Select / With Description and Error
• Select / Placeholder
• Select / Label with Tooltip
• Select / Custom Rendering
• Select / Multiple Item
• Select / Multiple with Custom Indicator
• Select / More Example
• Select / Select
• Select / Select.Option

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Generated by Kumo Visual Regression