fix(ui): restore focus in stacked dialogs (#44928)

Co-authored-by: Brendan Allan <14191578+Brendonovich@users.noreply.github.com>

packages/ui/src/context/dialog.tsx

@@ -88,10 +88,10 @@ function init() {
         setClosing = setClosingSignal
         return (
           <Kobalte
-            modal
+            modal={stack().at(-1)?.id === id}
             open={!closing()}
             onOpenChange={(open: boolean) => {
-              if (open) return
+              if (open || stack().at(-1)?.id !== id) return
               close(id)
             }}
           >