chore: update @vitejs/plugin-react to 6.0.0

[Noojuno]

REQUIRES #999 (stacked on top but unable to actually target it with a PR in this repo, so we're targeting main)

What Changed

Updates @vitejs/plugin-react to 6.0.0 with the Vite 8 release.

I had to specifically configure the ts and jsx parsers in babel options due to some quirks with how the babel parser was working by default with our packages/ directory.

Why

Aiming to try help keep the packages up to date here.

This isn't a required change as the old plugin still supports Vite 8 so we could definitely shelve it for now, but I was updating other stuff so I wanted to raise this too.

Checklist

• This PR is small and focused
• I explained what changed and why

Note

Update @vitejs/plugin-react to 6.0.0 and migrate Babel config to @rolldown/plugin-babel

• Bumps @vitejs/plugin-react from ^5.1.4 to ^6.0.0 and vite from ^8.0.0-beta.12 to ^8.0.0 in both apps/web/package.json and the root package.json.
• Moves React Compiler Babel config out of the react() plugin and into a standalone babel() call (via @rolldown/plugin-babel) in vite.config.ts, with explicit TypeScript and JSX parser options.
• Switches the package.json import in vite.config.ts from a named version export to a default pkg import; APP_VERSION is now sourced via pkg.version.

^{Macroscope summarized 275387c.}

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[juliusmarminge]

we can close #999 right? this has the commits from that PR already?

[Noojuno]

we can close #999 right? this has the commits from that PR already?

@juliusmarminge yeah, they were stacked but because I'm working on a fork I'm not allowed to stack for real 🙃