[examples] Fix nextjs with styled-components example

[mnajdova]

Fixes #27512

The PR implements #27088 (comment). It replaces the webpack alias with package alias. This also fixed the class name mismatch error.

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I will update the other examples in a separate PR.

[mui-pr-bot]

No bundle size changes (experimental)

Generated by 🚫 dangerJS against 75f740e

[oliviertassinari]

@mnajdova Did you have the opportunity to look at why we have this warning? I'm asking because we have the same issue with our documentation. It might be a reproduction simpler to investigate.

[mnajdova]

@mnajdova Did you have the opportunity to look at why we have this warning? I'm asking because we have the same issue with our documentation. It might be a reproduction simpler to investigate.

I haven't look too deep, I just tested that it is fixed by these changes, to be honest, I am not sure why. I will check later today tomorrow to see if the docs will still have the warning if we use package alias too (currently it depend on babel alias)

[oliviertassinari]

Looks great

[mnajdova]

@mnajdova Did you have the opportunity to look at why we have this warning? I'm asking because we have the same issue with our documentation. It might be a reproduction simpler to investigate.

I tried to configure the docs to use package alias, but I didn't manage to. No matter what I use in the package.json in the end the babel alias wins.