Settings and the shortcuts list close from the corner

Both have nothing to confirm, so their only button was a lone X at the
foot of the card, below the fold of a long Settings card. A dialog with a
confirm keeps Cancel beside it at the bottom, where the pair belongs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   "Downloaded" toast is only for a file on your screen.
 - "Check every feed" checks every feed you subscribe to, not every feed on the server.
 - The Classic theme is listed in Settings as just "Classic".
+- Settings and the keyboard shortcuts close from an X in their top corner, not a button at the bottom.
 
 ### Fixed