Implement editor level future message handler (#4182)

* Implement proper editor level async message handler

* Take application_io and wake callback as Editor::new arguments

* Rename AsyncMessage -> FutureMessage

* add DesktopWrapperMessage::Wake

---------

Co-authored-by: Timon <me@timon.zip>

frontend/wrapper/src/helpers.rs

@@ -108,6 +108,17 @@ pub(crate) async fn poll_node_graph_evaluation() {
 	});
 }
 
+/// Web wake callback: queues a microtask that dispatches [`FutureMessage::Wake`].
+#[cfg(all(not(feature = "native"), target_family = "wasm"))]
+pub(crate) fn async_wake_callback() -> Wake {
+	use std::sync::Arc;
+	Arc::new(|| {
+		wasm_bindgen_futures::spawn_local(async {
+			wrapper(|wrapper| wrapper.dispatch(FutureMessage::Wake));
+		});
+	})
+}
+
 pub(crate) fn auto_save_all_documents() {
 	// Process no further messages after a crash to avoid spamming the console
 	if EDITOR_HAS_CRASHED.load(Ordering::SeqCst) {