fix: Vanilla blocks return true for editor.isEditable on initial render

[matthewlipski]

This PR fixes an issue where getting editor.isEditable in the render function of a vanilla JS block would return true, regardless of if the editor is actually editable.

This is because editor.isEditable is set in a useEffect hook in BlockNoteViewComponent, which updates the value async, and so it can happen after the block has already rendered.

I've changed it so editor.isEditable is also set in BlockNoteViewEditor, before the editor is mounted, ensuring the value is correct before any vanilla blocks are rendered.

Closes #1477

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Name	Status	Preview	Updated (UTC)
blocknote	❌ Failed (Inspect)		Aug 7, 2025 1:59pm
blocknote-website	❌ Failed (Inspect)		Aug 7, 2025 1:59pm

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commit: ce65975

[nperez0111]

Yep, this seems better than what I had come up with