chore(styleguide): use 'tsup' instead of 'tsc' to compile styleguide

[trm217]

This PR bundles the styleguide with tsup rather than tsc.
We bundle the code both as CJS and ESM to allow using it in our frontends, as well as the API.
Since the exports in key in the styleguides package.json now points to the bundled ESM rather than the ts files within the src directly (which was wrong to begin with 🙄), running styleguide + in parallel in dev-mode might feel less responsive (not that it was fast up until now 😛)

[jstcki]

Yay, nice! Not sure why this would be less responsive than running tsc in dev mode, even if the import pointed to ts files.

The reason why it pointed to ts files was because we had the SG in transpilePackages. If we want to go through tsup anyway, then we should remove that as well.

[jstcki]

Another thing I noticed: editor integration is broken now, Intellisense will point to the minified chunk file in dist/

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[jstcki]

Intellisense is working now but I get a new error during development, whenever I change something in styleguide:

This shows up during Fast Refresh but goes away after a page reload (also when Next.js reloads on its own)

[jstcki]

Also this error now shows up in the console:

I think is because the .js loader should be different in dev than prod

[jstcki]

For the minify option, this looks like a nicer approach than checking for NODE_ENV:

export default defineConfig((options) => {
  return {
    minify: !options.watch,
  }
})

[jstcki]

Intellisense is working now but I get a new error during development, whenever I change something in styleguide:

This shows up during Fast Refresh but goes away after a page reload (also when Next.js reloads on its own)

Seems to be better when clean is turned off (again, make this dependent on options.watch?)

[jstcki]

Also, styleguide is still in next.config.js transpilePackages. I don't think that's necessary anymore.

[trm217]

@jstcki seems to work fine with minifiy and clean being set to !options.watch.
Could you try again as well?