feat(ui): add Mosaic Select component

[alexcarpenter]

Description

Adds a Mosaic Select component built on the @clerk/headless select primitive, following the Menu component's structure. The selected option opens over the trigger by default (alignItemWithTrigger), with outline and ghost trigger variants. Adds Swingset docs and stories.

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 10:49pm UTC
swingset	Ready	Preview	Sep 10, 2026 10:49pm UTC

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🦋 Changeset detected

Latest commit: 2a51367

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

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commit: 2a51367

[maxyinger]

two small things clicking around:

1. should we use Freeze on the pupop on exit?
2. this scroll example is feeling a little off. might just be peculiarly anchored but figured I'd share:
   https://github.com/user-attachments/assets/2712ff9b-e2c8-4693-9697-1db3394db270