Fix AlertDialog ARIA

packages/core/src/components/alert-dialog/alert-dialog-content.tsx

@@ -43,8 +43,8 @@ export function AlertDialogContent(props: AlertDialogContentProps): JSX.Element
         id={ctx.contentId()}
         role="alertdialog"
         aria-modal="true"
-        aria-labelledby={ctx.titleId() ?? undefined}
-        aria-describedby={ctx.descriptionId() ?? undefined}
+        aria-labelledby={ctx.titleId() || undefined}
+        aria-describedby={ctx.descriptionId() || undefined}
         data-state={ctx.isOpen() ? "open" : "closed"}
         {...rest}
       >

packages/core/src/components/alert-dialog/alert-dialog-root.tsx

@@ -13,8 +13,11 @@ import {
 
 /** Props for the AlertDialog root. */
 export interface AlertDialogRootProps {
+  /** Controls open state externally. */
   open?: boolean;
+  /** Initial open state when uncontrolled. */
   defaultOpen?: boolean;
+  /** Called when open state changes. */
   onOpenChange?: (open: boolean) => void;
   children: JSX.Element;
 }

packages/core/src/components/alert-dialog/alert-dialog-trigger.tsx

@@ -18,7 +18,14 @@ export function AlertDialogTrigger(props: AlertDialogTriggerProps): JSX.Element
   };
 
   return (
-    <button type="button" aria-haspopup="dialog" onClick={handleClick} {...rest}>
+    <button
+      type="button"
+      aria-haspopup="dialog"
+      aria-controls={ctx.contentId()}
+      aria-expanded={ctx.isOpen() ? "true" : "false"}
+      onClick={handleClick}
+      {...rest}
+    >
       {local.children}
     </button>
   );