Make alert dialog footer buttons 44px below md

The same treatment `ui/dialog.tsx` got: every footer button is a 44px
target on a phone; desktop keeps its sizes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013GAeg4Jo6xjZzjwy9QDWMQ

frontend/src/components/ui/alert-dialog.tsx

@@ -91,7 +91,8 @@ function AlertDialogFooter({
     <div
       data-slot="alert-dialog-footer"
       className={cn(
-        "flex flex-col-reverse gap-2 group-data-[size=sm]/alert-dialog-content:grid group-data-[size=sm]/alert-dialog-content:grid-cols-2 sm:flex-row sm:justify-end",
+        // Whatever size a button asked for, it is a 44px target on a phone.
+        "flex flex-col-reverse gap-2 group-data-[size=sm]/alert-dialog-content:grid group-data-[size=sm]/alert-dialog-content:grid-cols-2 sm:flex-row sm:justify-end max-md:[&_button]:h-11",
         className
       )}
       {...props}