chore(sandbox): add react 19 rc example

[anubra266]

add react 19 rc example

[changeset-bot]

⚠️ No Changeset found

Latest commit: d5f2f0b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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The package "react-19" depends on the ignored package "@zag-js/shared", but "react-19" is not being ignored. Please add "react-19" to the `ignore` option.

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