fix: resolve several drag & drop issues

[nperez0111]

This adjusts the logic for drag & drop (especially between editor instances) to handle things better.

There is still some more testing needed, but I wanted visibility of it.

I also want to fix the drag previews in this PR

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jul 11, 2025 4:52pm
blocknote-website	❌ Failed (Inspect)		Jul 11, 2025 4:52pm

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commit: ca4f365