feat(slint): mark bit-perfect-capable devices in the output select

The output-device select now shows an accent BP marker on devices
able to deliver bit-perfect audio: every ALSA hw card, hardware nodes
on PipeWire, none under PulseAudio. QbzSelect gained an optional
parallel badges array so other selects are unaffected.

cc

crates/qbz-slint/ui/settings/AudioSettings.slint

@@ -96,6 +96,7 @@ export component AudioSettings inherits VerticalLayout {
         QbzSelect {
             menu-width: 300px;
             options: SettingsState.devices;
+            badges: SettingsState.device-bp;
             current-index: SettingsState.device-index;
             selected(i) => {
                 SettingsState.device-index = i;