Use wpctl instead of pactl to switch default audio sink (#5236)

pactl set-default-sink only updates PipeWire's default.audio.sink
metadata, but WirePlumber immediately overrides it back because
default.configured.audio.sink remains unchanged. wpctl set-default
updates both, making the switch actually persist.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bin/omarchy-cmd-audio-switch

@@ -53,7 +53,8 @@ fi
 next_sink_volume_icon="sink-volume-${icon_state}-symbolic"
 
 if [[ $next_sink_name != $current_sink_name ]]; then
-  pactl set-default-sink "$next_sink_name"
+  next_sink_wpid=$(echo "$next_sink" | jq -r '.properties."object.id"')
+  wpctl set-default "$next_sink_wpid"
 fi
 
 omarchy-swayosd-client \