feat: use Quickshell-internal idle inhibitor

This was a pain to set up properly...

modules/bar/popouts/IdleInhibit.qml

@@ -23,7 +23,7 @@ ColumnLayout {
     Toggle {
         label.text: qsTr("Inhibit While Playing Audio")
         checked: Idle.inhibitPipewire
-        toggle.onToggled: Idle.toggleInhibitPipewire()
+        toggle.onToggled: Idle.inhibitPipewire = !Idle.inhibitPipewire
     }
 
     component Toggle: RowLayout {

modules/ui/UI.qml

@@ -30,6 +30,7 @@ Variants {
 
             UIState {
                 id: uiState
+                window: window
                 screen: scope.modelData
             }
 

modules/ui/UIState.qml

@@ -8,12 +8,15 @@ import Quickshell.Hyprland
 Scope {
     id: root
 
+    required property QtObject window
     required property ShellScreen screen
     property alias uiState: uiState
 
     PersistentProperties {
         id: uiState
-        reloadableId: `uiState-${QsWindow.window.screen.name}`
+        reloadableId: `uiState-${root.screen.name}`
+
+        readonly property QtObject window: root.window
 
         // Open panels
         property bool dashboard