feat(ui): add gray scale and restructure Mosaic color tokens to match Figma

[alexcarpenter]

Description

Aligns the Mosaic color tokens with the Figma design system: adds the base/gray/* scale and restructures the semantic tokens into Figma's foreground, background, border, brand, and status groups.

Adds --cl-color-neutral (black on light, white on dark) and an internal neutralAlpha scale of fixed-opacity mixes of it. Every hover, pressed, and resting wash in button, badge, menu, item, avatar, and banner now reads from that scale instead of an inline color-mix, so they composite the same on any backdrop and retint together when the neutral is overridden.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Sep 10, 2026 1:45am UTC
swingset	Ready	Preview	Sep 10, 2026 1:45am UTC

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🦋 Changeset detected

Latest commit: 644a77d

The changes in this PR will be included in the next version bump.

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commit: 644a77d