extract IdleInhibitService singleton from IdleInhibitorModule

shell/services/IdleInhibitService.qml

@@ -0,0 +1,31 @@
+pragma Singleton
+
+import QtQuick
+import Quickshell.Io
+
+QtObject {
+    id: root
+
+    property bool active: false
+    property string inhibitors: ""
+
+    function toggle() {
+        active = !active;
+    }
+
+    function refreshInhibitors() {
+        _listProc.running = true;
+    }
+
+    property Process _inhibitor: Process {
+        command: ["systemd-inhibit", "--what=idle", "--who=nova-shell", "--why=user", "sleep", "infinity"]
+        running: root.active
+    }
+
+    property Process _listProc: Process {
+        command: ["sh", "-c", "systemd-inhibit --list 2>/dev/null | grep -i idle | awk '{print $NF}' | sort -u | tr '\\n' ', ' | sed 's/, $//'"]
+        stdout: StdioCollector {
+            onStreamFinished: root.inhibitors = text.trim() ? "Blocked by: " + text.trim() : ""
+        }
+    }
+}