Desktop: permission-ask sound never plays with the new layout #48801

Description

With the new layout designs enabled, the desktop app never plays the permission-ask sound, even though the sound is enabled in settings. The session tab still shows the attention indicator (blue dot), and the turn-complete and error sounds still play normally.

Steps to reproduce

1. Have general.newLayoutDesigns enabled (it is the default now) and sounds.permissionsEnabled: true.
2. Ask the agent to run a tool that requires permission.
3. The in-app permission request appears and the tab shows the attention indicator, but no sound plays. Meanwhile "finished" and "error" sounds still play.

Cause

The permission.asked sound (playSoundById(settings.sounds.permissions())) and the permission/question native notifications are only wired up in LegacyLayout's useSDKNotificationToasts in packages/app/src/pages/layout.tsx. NewLayout (packages/app/src/pages/layout-new.tsx) never mounts that hook, so the alert is skipped. Turn-complete and error sounds live in the shared NotificationProvider, which is why they are unaffected.

OpenCode version

1.18.30

Operating System

macOS 26