fix: insert file upload before block if it is closer to the top of the block

[nperez0111]

This closes #1851 by measuring the DOM node & inserting the file before the dropped on block if the cursor was closer to the top than the bottom

[vercel]

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jul 18, 2025 1:18pm
blocknote-website	✅ Ready (Inspect)	Visit Preview	Jul 18, 2025 1:18pm

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commit: a4b5392