feat: migrate sheet component

[alinalaura]

Closes #

📄 Description

Please include a summary of the changes made in this PR.

🚀 Demo

If applicable, please add a screenshot or video to illustrate the changes.

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🔮 Design review

• Design review done
• No design review needed

✅ Definition of Done

• Unit tests added/updated (.spec.ts) - not needed because there is no logic to test
• Interaction/component tests added/updated (.component.play.ts)
• Visual regression tests added/updated and approved (.visual.play.ts)
• Accessibility tests added/updated (.a11y.play.ts)
• Keyboard navigation and focus behavior tested
• Page Object (packages/playwright) up to date with component changes
• Design tokens use alias tokens only (no direct Global token references)
• Manually tested in supported browsers (desktop + mobile)
• Changeset added (pnpm changeset)
• Storybook documentation updated

📝 Checklist

• ✅ My code follows the style guidelines of this project (STYLE_GUIDE.md)
• 🛠️ I have performed a self-review of my own code
• ⚠️ My changes generate no new warnings or errors

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Project	Deployment	Actions	Updated (UTC)
design-system	Ready	Preview	Aug 20, 2026 12:31pm
design-system-core	Ready	Preview	Aug 20, 2026 12:31pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
design-system-toky	Skipped		Aug 20, 2026 12:31pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 6b9c2bd

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

This PR includes changesets to release 7 packages

Name	Type
@baloise/ds-core	Minor
@baloise/ds-angular	Minor
@baloise/ds-react	Minor
@baloise/ds-assets	Minor
@baloise/ds-css	Minor
@baloise/ds-playwright	Minor
@baloise/ds-tokens	Minor

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