Fix async bug and add sound component for notification sound

src/routes/+layout.svelte

@@ -110,6 +110,7 @@
   import * as notifications from "@app/util/notifications"
   import * as appState from "@app/core/state"
   import {badgeCount, handleBadgeCountChanges} from "@app/util/notifications"
+  import NewNotificationSound from "@src/app/components/NewNotificationSound.svelte"
 
   // Migration: old nostrtalk instance used different sessions
   if ($session && !$signer) {
@@ -508,5 +509,6 @@
     </AppContainer>
     <ModalContainer />
     <div class="tippy-target"></div>
+    <NewNotificationSound />
   </div>
 {/await}