diff --git a/src/web/components/SiteCreatedModal.test.tsx b/src/web/components/SiteCreatedModal.test.tsx
new file mode 100644
index 0000000..65ad4be
--- /dev/null
+++ b/src/web/components/SiteCreatedModal.test.tsx
@@ -0,0 +1,30 @@
+import { describe, expect, it, vi } from 'vitest';
+import { act, create } from 'react-test-renderer';
+import SiteCreatedModal from './SiteCreatedModal.js';
+
+describe('SiteCreatedModal', () => {
+  it('routes native dialog cancel events through onClose cleanup', async () => {
+    const onChoice = vi.fn();
+    const onClose = vi.fn();
+    const root = create(
+      <SiteCreatedModal
+        siteName="Demo Site"
+        platform="new-api"
+        onChoice={onChoice}
+        onClose={onClose}
+      />,
+    );
+
+    const dialog = root.root.findByType('dialog');
+    expect(typeof dialog.props.onCancel).toBe('function');
+
+    const preventDefault = vi.fn();
+    await act(async () => {
+      dialog.props.onCancel({ preventDefault });
+    });
+
+    expect(preventDefault).toHaveBeenCalledTimes(1);
+    expect(onClose).toHaveBeenCalledTimes(1);
+    expect(onChoice).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/web/components/SiteCreatedModal.tsx b/src/web/components/SiteCreatedModal.tsx
index d060468..d247e88 100644
--- a/src/web/components/SiteCreatedModal.tsx
+++ b/src/web/components/SiteCreatedModal.tsx
@@ -27,18 +27,14 @@ export default function SiteCreatedModal({ siteName, platform, onChoice, onClose
     };
   }, []);
 
-  const handleKeyDown = (e: React.KeyboardEvent) => {
-    if (e.key === 'Escape') {
-      e.preventDefault();
-      onChoice('later');
-    }
-  };
-
   return (
     <dialog
       ref={dialogRef}
       className="modal"
-      onKeyDown={handleKeyDown}
+      onCancel={(event) => {
+        event.preventDefault();
+        onClose();
+      }}
       onClick={(e) => {
         if (e.target === dialogRef.current) {
           onChoice('later');
@@ -80,4 +76,4 @@ export default function SiteCreatedModal({ siteName, platform, onChoice, onClose
       </div>
     </dialog>
   );
-}
\ No newline at end of file
+}