Add speaker selection to the microphone quick menu

The microphone chevron listed input devices only, so changing the output
device meant leaving the call controls for the settings modal.

Render the audio menu as two sections, Speaker above Microphone, and wire
the output device list, selection and select callback through the footer
view model. Entries are shown but disabled where the platform cannot switch
that kind of device, or where only one exists, so the menu keeps the same
shape everywhere.

Spec: FEATURES_SPEC/2026-09_Quick_Audio_Menu.md — AC1, AC6, AC7, AC8

locales/en/app.json

@@ -218,6 +218,7 @@
       "change_device_button": "Change audio device",
       "default": "Default",
       "default_named": "Default <2>({{name}})</2>",
+      "default_named_plain": "Default ({{name}})",
       "handset": "Handset",
       "loudspeaker": "Loudspeaker",
       "microphone": "Microphone",