add systemd and machinectl bar modules with applets

shell/modules/SystemdModule.qml

@@ -0,0 +1,55 @@
+import QtQuick
+import Quickshell
+import "." as M
+import "../services" as S
+import "../applets" as C
+
+M.BarModule {
+    id: root
+    active: S.Modules.systemd.enable
+    tooltip: {
+        const sys = S.SystemdService.systemState;
+        const fc = S.SystemdService.totalFailedCount;
+        return "systemd: " + sys + (fc > 0 ? " (" + fc + " failed)" : "");
+    }
+    panelNamespace: "nova-systemd"
+    panelContentWidth: 300
+    panelComponent: Component {
+        C.SystemdApplet {
+            width: parent.width
+            accentColor: root.accentColor
+            active: root._showPanel
+        }
+    }
+
+    Connections {
+        target: S.SystemdService
+        function onSystemUnitsChanged() {
+            root.keepPanelOpen(300);
+        }
+        function onUserUnitsChanged() {
+            root.keepPanelOpen(300);
+        }
+    }
+
+    readonly property color _stateColor: {
+        const st = S.SystemdService.systemState;
+        if (st === "running")
+            return root.accentColor;
+        if (st === "degraded")
+            return S.Theme.base0A;
+        return S.Theme.base08;
+    }
+
+    M.BarIcon {
+        icon: ""
+        color: root._stateColor
+        anchors.verticalCenter: parent.verticalCenter
+    }
+    M.BarLabel {
+        label: S.SystemdService.totalFailedCount > 0 ? S.SystemdService.totalFailedCount + " failed" : S.SystemdService.systemState
+        minText: "degraded"
+        color: root._stateColor
+        anchors.verticalCenter: parent.verticalCenter
+    }
+}