Fix/css filename output

[rschristian]

Fixes #779

I'd love to do / add some better detection here, but not sure how reasonable it is considering the current state of things. Ideally (in my mind at least) names would be chosen in a way resembling the following order:

• a ".css" key in "exports"
• "exports": { "./": { default } }
• "exports": { "./" }, if it's a string
• "exports", if it's a string
• "main"
• options.output

I believe that'd make sense as a set of fallbacks, but the point is that those would be some reasonable items to use as the CSS file name.

However, besides #784 we're not currently using "exports" for any detection / output customization so it would feel weird to have CSS be the first thing to utilize that. Certainly happy to add that if it'd make sense to do so!

[changeset-bot]

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