test(desktop): press Escape until the failed-install listener is bound

The overlay binds its Escape handler in a passive effect keyed on the failed state, which can
flush after "Installation failed" is already painted. The test pressed Escape once right after
findByText, so on a loaded runner the key landed before the listener existed and the overlay
(correctly) stayed up for the whole waitFor. Proof: delaying the listener by 80 ms reproduces the
CI red on the old test and passes the new one.

apps/desktop/src/components/desktop-install-overlay.test.tsx

@@ -567,9 +567,12 @@ describe('DesktopInstallOverlay first-run setup', () => {
 
     expect(await screen.findByText('Installation failed')).toBeTruthy()
 
-    fireEvent.keyDown(window, { key: 'Escape' })
-
-    await waitFor(() => expect(screen.queryByText('Installation failed')).toBeNull())
+    // The Escape listener is bound in a passive effect that can flush after the failed state is
+    // already painted; a key landing in that gap is (correctly) ignored, so press until it is heard.
+    await waitFor(() => {
+      fireEvent.keyDown(window, { key: 'Escape' })
+      expect(screen.queryByText('Installation failed')).toBeNull()
+    })
   })
 })