Update Tooltip.tsx to fix react-dom-server leaking into client bundle

[xHomu]

react-dom-server is leaking into the client bundle because it's used in eactly one place in Tooltip.tsx:

Removing it cut about 70kb off the bundle:

@pogseal Making this a PR first, since I don't know whether this would break any tooltips in use atm.

[pogseal]

So this is used to render JSX in a tooltip where it would typically load a string. I believe it's used in some places like the character showcase. Though 70kb is a good amount, I wonder if can dynamic import or find a lighter tooltip library.

[xHomu]

@pogseal looks like lazily worked. Is there a page to test against?

[pogseal]

Cool, hovering over any of the stats on the character showcase should work.

[xHomu]

Mhm, not working right, don't merge yet.

[xHomu]

lazy import react-dom/server doesn't work. Have to take a different approach.