initial ai assistance

test/dialogs.test.tsx

@@ -145,6 +145,8 @@ describe('the property editor uses icons, not text glyphs', () => {
     }
     expect(q('[aria-label="Add entry"] svg')).not.toBeNull()
     expect(q('.cms-group > summary svg.cms-chev')).not.toBeNull()
+    expect(q('.cms-actions')).toBeNull() // nothing changed yet: no footer
+    await act(async () => click(q('[aria-label="Add item"]')!))
     expect(q('.cms-actions .cms-btn--primary svg')).not.toBeNull()
   })
 })