feat: Add Modal recipe with overlay, header, body, and footer parts

[alexgrozav]

Summary

• Adds 5 new Modal recipes: useModalRecipe, useModalHeaderRecipe, useModalBodyRecipe, useModalFooterRecipe, and useModalOverlayRecipe — following the same structure as the Card recipes with non-semantic colors (light, dark, neutral), 3 visual variants (solid, soft, subtle), and 3 sizes (sm, md, lg).
• Adds Storybook stories with interactive open/close via overlay, preview grids for all variant/color combinations and sizes, and a fullscreen modal example.
• Adds documentation page at docs/06.components/02.composables/07.modal.md covering usage, colors, variants, sizes, anatomy, accessibility, customization, and API reference.

Test plan

• Run pnpm test in theme/ to verify all modal recipe unit tests pass
• Open Storybook and verify Default, AllVariants, AllSizes, and Fullscreen stories render correctly
• Verify dark mode overrides work for neutral color
• Review documentation page in the docs site

[changeset-bot]

🦋 Changeset detected

Latest commit: b4e6d63

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

This PR includes changesets to release 2 packages

Name	Type
@styleframe/theme	Minor
styleframe	Minor

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[vercel]

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Project	Deployment	Actions	Updated (UTC)
app-styleframe-dev-production	Ready	Preview, Comment	Apr 5, 2026 2:53pm
styleframe-dev-production	Ready	Preview, Comment	Apr 5, 2026 2:53pm
styleframe-storybook	Ready	Preview, Comment	Apr 5, 2026 2:53pm

[codecov]

Codecov Report

❌ Patch coverage is 99.82548% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
theme/src/recipes/index.ts	0.00%	1 Missing ⚠️

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