Add classes for generic usages of (status) field borders

[frankier]

I opted to add classes for these. The reason is is that the remaining reasons are somewhat generic and don't have a clear scope in terms of semantic tags. I believe the quoted text from the Microsoft Windows User Experience supports this.

Fixes https://github.com/jdan/98.css/issues/73

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Name	Status	Preview	Comments	Updated (UTC)
98css	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 7, 2024 11:25am

[chanagaray]

Thank you!