✨(frontend) add speaker select component for audio output configuration

Introduce speaker selection component requested by users to allow audio
output device configuration before entering calls.

Enables users to test and configure their preferred audio output device
during prejoin setup, ensuring proper audio routing before call begins.
Improves user experience by preventing audio issues during meetings.

src/frontend/src/locales/nl/rooms.json

@@ -27,6 +27,10 @@
       "enable": "Microfoon dempen opheffen",
       "label": "Microfoon"
     },
+    "audiooutput": {
+      "choose": "Selecteer luidspreker",
+      "permissionsNeeded": "Selecteer luidspreker - Toestemming vereist"
+    },
     "effects": {
       "description": "Pas effecten toe",
       "title": "Effecten",