Unit tests

[shinokada]

🔗 Related issue (optional)

Closes #

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📑 Description

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🔍 PR Type

• Bug fix
• Feature
• Documentation
• Refactor / Code cleanup
• Build / Tooling
• Other (please describe)

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🚦 PR Status

• Draft (work in progress, not ready for review)
• Ready for review ✅

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✅ Checklist

• My code follows the existing code style
• I have run pnpm lint && pnpm check && pnpm test:e2e and all tests pass
• CoderabbitAI review has been completed and actionable suggestions were reviewed
• I have updated documentation if my changes require it
• My PR is based on the latest main branch (not the published npm version)
• I have checked accessibility where applicable (ARIA, keyboard nav, etc.)
• I have reviewed the rendered component in the browser

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🧪 Screenshots / Demos (optional)

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⚠️ Breaking Changes (optional)

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ℹ️ Additional Information

Summary by CodeRabbit

• New Features

  • Expanded theming: multiple runtime palettes, new "load from static" theme option, richer color variants, and Popper prop to disable transitions.

• Bug Fixes

  • Improved focus/keyboard handling and more robust clipboard copy/write flows across overlays and dialogs.

• Tests

  • Large-scale additions: comprehensive test suites and helpers covering typography, media, layout, extend components, and utilities.

• Style

  • Typography metrics migrated to rem units; primary/brand color tokens refreshed.

• Documentation

  • Added guides on reactive contexts, test setup, timer usage, and a popover polyfill.

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