DialogFooter showCloseButton was rendering a third button (Close) next
to the Cancel + 'Yes, delete' / 'Yes, unpair' pair. The corner X icon
already closes the dialog, so the extra button was just visual noise.
Drop the prop on both account-card dialogs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>