fix(slint): correct BP marking and widen the output-device list

The BP badge marked every ALSA device; it now marks only the direct
hardware PCMs (hw:/front:/iec958:/hdmi:), matching Tauri — sysdefault
and plug devices are not bit-perfect. The device list also opens at
480px (right-anchored) so the full card + PCM id name is readable
instead of being elided in a 300px control.

cc

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

@@ -95,6 +95,9 @@ export component AudioSettings inherits VerticalLayout {
         description: @tr("The DAC or sound device that receives audio.");
         QbzSelect {
             menu-width: 300px;
+            // Device labels run long; open the list wider so the full
+            // name (card + ALSA PCM id) is readable.
+            popup-width: 480px;
             options: SettingsState.devices;
             badges: SettingsState.device-bp;
             current-index: SettingsState.device-index;