chore: release 4.0.0

[FRSgit]

Related issue

Migrate to React 19

Scope of work

Screenshots of visual changes

Checklist

• [x] Self code-reviewed
• [x] Changes documented
• [x] Semantic HTML
• [x] SSR-friendly
• [x] Caching friendly
• [x] a11y for WCAG 2.0 AA
• [x] examples created
• [x] blocks created
• [x] cypress tests created

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 93cea9dfbdfc7768cbf3c8e6c67f1430c75d2a34

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

This PR includes changesets to release 2 packages

Name	Type
@storefront-ui/vue	Patch
@storefront-ui/nuxt	Patch

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