Fix shift displacement for tooltip plugin

[KBHertzog]

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Summary

These changes solve an existing bug where the tooltip (and link tooltip) would position themselves off the page. See here for more information: #1548

How did you test this change?

Here are screenshot of my local development environment. This example uses the link-tooltip plugin as an example. As seen in the linked issue, without the attached changes the tooltip overflows the page. These screenshots show the addition of shift with a static 8px.

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Name	Status	Preview	Comments	Updated (UTC)
milkdown-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2025 8:13pm

[Saul-Mirone]

Let me know when this pr is ready for reviewing :)

[KBHertzog]

@Saul-Mirone This should be ready. Let me know if you need more extensive testing information. I plan on resolving the merge conflict later today