deno desktop: Deno.BrowserWindow.close()/hide() hangs the UI for secondary windows (macOS)

### Version deno 2.9.0+94d375d (canary, release, aarch64-apple-darwin) `deno desktop` ### Summary Calling `close()` (or `hide()`) on a **secondary** `Deno.BrowserWindow` (i.e. any window other than the first/adopted main window) hangs the app's UI — the window shows a spinning beachball and never closes. The Deno-side `close()` call itself returns, but the window's UI thread is frozen. The main (adopted) window closes fine. Other operations on secondary windows (`navigate`, `setTitle`, `setSize`, bindings/HTTP) work normally — only the window-destruction/visibility operations (`close()`, `hide()`) hang. ### Reproduction Run with `deno desktop repro.ts` on macOS: ```ts /// <reference lib="deno.desktop" /> const server = Deno.serve(() => new Response("<h1>secondary window</h1>", { headers: { "content-type": "text/html" }, }) ); const origin = `http://127.0.0.1:${server.addr.port}`; // First BrowserWindow adopts the auto-opened main window. const _main = new Deno.BrowserWindow({ title: "main", width: 400, height: 200 }); // A second window. const secondary = new Deno.BrowserWindow({ title: "secondary", width: 400, height: 200 }); secondary.navigate(origin); secondary.show(); // Close the secondary window programmatically after 3s. setTimeout(() => { console.log("calling secondary.close() ..."); secondary.close(); // <-- UI hangs here; the window never closes console.log("secondary.close() returned"); }, 3000); ``` ### Expected After ~3s the secondary window closes. ### Actual The secondary window freezes (spinning beachball) and never closes. `"secondary.close() returned"` is printed (the Deno-side call returns), but the window's UI is frozen. ### Additional context - Reproduces from every calling context: a timer (above), the window's `"close"` event handler, and inside an HTTP request handler. Deferring with `setTimeout(0)` does not help. - `secondary.hide()` hangs the same way. - Closing the **main** (first/adopted) window works fine.