fix: react 19 strict mode compatibility

[YousefED]

closes #1618

I think this was caused because in React 19, "refs" also quickly remount when in StrictMode.

We didn't correctly cleanup when the editor was unmounted, causing a nested flushSync here

Ideally we add a test for this, but this might be complicated with our setup (the main repo now uses React 18).

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[YousefED]

@nperez0111 upon a second look it seems like unmount was added here: ueberdosis/tiptap@8de8e13#diff-9b7c004a70a95a9e7b2b49f3761403a4abfe14fae1490e32c86306794017e27dR171

I suppose the right solution would be to update tiptap and call unmount instead, right?

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commit: 5c6c942

[nperez0111]

@YousefED in the future, yes. But, that is still on their v3 beta so will be part of the larger upgrade to v3. For now, this is a valid fix