feat!: migrate to react 19

[FRSgit]

Related issue

Closes #

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