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/zh.ts

@@ -500,6 +500,7 @@ export const zhTranslation = {
     audioOutputDeviceRefresh: '刷新设备列表',
     audioOutputDeviceOsDefaultNow: '当前系统输出',
     audioOutputDeviceListError: '无法加载音频设备列表。',
+    audioOutputDeviceNotInCurrentList: '不在当前列表中',
     hiResTitle: '原生高清晰度播放',
     hiResEnabled: '启用原生高清晰度播放',
     hiResDesc: "默认强制 44.1 kHz 输出以获得最大稳定性。仅在硬件和网络可靠支持高采样率（88.2 kHz+）时启用。",