feat: markdown pasting & custom paste handlers

[nperez0111]

This implements markdown pasting, and custom paste handlers.

Adds

• editor.pasteText which will paste text content into the editor
• editor.pasteHTML which will convert HTML into BlockNote HTML and then paste that into the editor
• editor.pasteMarkdown which will convert the markdown into BlockNote HTML and then paste that into the editor
• editorOptions.pasteHandler for allowing the developer the ability to customize how content is pasted into the editor while still allowing the default paste behavior.

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Name	Status	Preview	Updated (UTC)
blocknote	🛑 Canceled (Inspect)		Mar 31, 2025 3:37pm
blocknote-website	✅ Ready (Inspect)	Visit Preview	Mar 31, 2025 3:37pm

[YousefED]

@nperez0111 didn't review yet; but I just noticed (working on sth unrelated) that actually inline content markdown gets parsed. try pasting xx \*\*hello world\*\*. Did you know this / know where this is done? Tiptap feature?

[nperez0111]

@nperez0111 didn't review yet; but I just noticed (working on sth unrelated) that actually inline content markdown gets parsed. try pasting xx \*\*hello world\*\*. Did you know this / know where this is done? Tiptap feature?

https://github.com/ueberdosis/tiptap/blob/dd0a25f5b48867992dd68d3effd5c98ddafcab69/packages/extension-bold/src/bold.tsx#L134-L145

Bold already has a paste rule set up. As well as a number of other Tiptap extensions. What does not work (in blocknote) though would be things across paragraphs or code blocks for example