test: wait for SelectPanel initial focus state

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: joshblack

packages/react/src/SelectPanel/SelectPanel.test.tsx

@@ -1673,11 +1673,10 @@ for (const usingRemoveActiveDescendant of [false, true]) {
         const input = screen.getByPlaceholderText('Filter items')
         const options = screen.getAllByRole('option')
 
-        // Wait a tick for the effect to run
-        await new Promise(resolve => setTimeout(resolve, 0))
-
-        // aria-activedescendant should be set to the first item
-        expect(input.getAttribute('aria-activedescendant')).toBe(options[0].id)
+        await waitFor(() => {
+          // aria-activedescendant should be set to the first item
+          expect(input.getAttribute('aria-activedescendant')).toBe(options[0].id)
+        })
       })
 
       it('should not set aria-activedescendant on mouse hover until after first interaction when setInitialFocus is true', async () => {