chore: Update React to v19

[matthewlipski]

This PR updates React to v19 and also bumps the Mantine version. This is mainly in order to fix some issues that are happening in #1654.

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jul 10, 2025 9:58am
blocknote-website	❌ Failed (Inspect)		Jul 10, 2025 9:58am

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commit: 34cc089