Guests in voice-rooms do not see "Leave call" button

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Steps to reproduce

1. Create a conversation, enable the lobby.
2. In call permissions, disable "Can start call" for participants/guests, enable "Skip lobby" and all other default permissions.
3. Start the call as moderator.
4. Join as a guest (unregistered user).

Expected behaviour

The guest should still see a "Leave call" button so they can exit the call.

Actual behaviour

The guest is connected to the call (audio/video), but no "Leave call" button is shown. There is no way to leave the call through the UI.

Talk app

Talk app version: 24.0.3

Browser

Microphone available: Yes

Camera available: Yes

Operating system: Windows 11 Pro

Browser name: Mozilla Firefox

Browser version: 153.0

Server configuration

Nextcloud Version: 34.0.1

Start by reproducing the issue with the listed lobby, call-permission, moderator, and guest steps in Firefox. Trace the voice-room call controls for an unregistered guest who is connected without permission to start calls; done means the guest can see and use a "Leave call" button while the existing permissions remain unchanged.