fix(nf): add support for tailwind 4 with only postcssconfig file

[JGhignatti]

While creating the plugin options passed to ESBuild, only the TailwindCSS config file was being used.
With TailwindCSS v4, it is possible to have a setup without a tailwind.config.js file, only a .postcssrc.json file. The PostCSS config is now used if present, the same way as Angular does.

Closes #964

[JGhignatti]

This PR fixes the lint error causing the pipeline to fail.

[Aukevanoost]

Hi @JGhignatti,

I appreciate the work you've put in these PR's. I'll take a look!

[JGhignatti]

Hi @Aukevanoost thanks for your help here and all around this project.
Do you think we could get a new release with this PR soon? It's preventing TailwindCSS v4 to properly work and I wasn't able to find a workaround.

[Aukevanoost]

Hi @JGhignatti,

Yeah I'd say so, but unfortunately no promises and it might take a bit. We're processing some other PR's as well.

[JGhignatti]

No problem. I'll keep an eye open for new versions, and new issues I can help on. Thanks again @Aukevanoost.

[Aukevanoost]

Hey @JGhignatti, Just wanted to tell you that I think the next release might take a little longer. I'm aiming for half December. Sorry for the inconvenience

[Aukevanoost]

Hi @JGhignatti, hope you're alright

It seems like your PR broke something on this issue, would you mind taking a look if we're missing something?

Thanks a bunch in advance