fix(audio): Linux output device selection and watcher (#176)

* fix(audio): stabilize Linux output device picker and watcher

Keep pinned ALSA/cpal device ids stable when enumeration omits the active
sink or returns an equivalent name. Stop Linux device-watcher from clearing
the pin based on missing list entries; macOS and Windows still treat repeated
absence as unplugged. Settings refresh flow calls canonicalize and refetches
the list; add i18n for the out-of-list device label.

* fix(settings): sort audio output devices by label

cpal enumeration order is arbitrary; order the dropdown by readable label
and place the current OS default device first among concrete outputs.

src/locales/de.ts

@@ -505,6 +505,7 @@ export const deTranslation = {
     audioOutputDeviceRefresh: 'Geräteliste aktualisieren',
     audioOutputDeviceOsDefaultNow: 'aktuelle Systemausgabe',
     audioOutputDeviceListError: 'Audiogeräteliste konnte nicht geladen werden.',
+    audioOutputDeviceNotInCurrentList: 'nicht in der aktuellen Liste',
     hiResTitle: 'Native Hi-Res-Wiedergabe',
     hiResEnabled: 'Native Hi-Res-Wiedergabe aktivieren',
     hiResDesc: "Standardmäßig wird auf 44,1 kHz begrenzt (maximale Stabilität). Nur aktivieren, wenn Hardware und Netzwerk zuverlässig hohe Abtastraten (88,2 kHz+) unterstützen.",