fix: bn-inline-content class name getting duplicated

[matthewlipski]

This PR fixes the bn-inline-content class name being added to React custom block's inline content element whenever its content changes.

Closes #1727

[vercel]

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jul 2, 2025 1:05pm
blocknote-website	❌ Failed (Inspect)		Jul 2, 2025 1:05pm

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commit: 8d15c2a