PRs to backport

[KonnorRogers]

• - Fix: Nested tab groups broken in v2.19.1 shoelace#2367
• - Fix a11y issues for closing components with focused children shoelace#2383

(not sure how relevant these are to the current state of things)

[claviska]

shoelace-style/shoelace#2367 was fixed when tabs were reworked in #68. Verified locally.

[claviska]

I can't repo shoelace-style/shoelace#2383 and I think that's because we switched to <dialog> so this isn't an issue anymore either.