put shell in subdir, and add nix package

shell/bar/systray/TrayMenuItem.qml

@@ -0,0 +1,29 @@
+import Quickshell
+import QtQuick
+import QtQuick.Layouts
+import "../.."
+
+ColumnLayout {
+    id: root
+    required property QsMenuEntry modelData
+    required property var rootMenu
+    property var leftItem
+    signal interacted
+
+    Rectangle {
+        visible: (root.modelData?.isSeparator ?? false)
+        color: ShellSettings.colors["surface_container_high"]
+        Layout.fillWidth: true
+        Layout.preferredHeight: 2
+        Layout.leftMargin: 8
+        Layout.rightMargin: 8
+    }
+
+    TrayMenuEntry {
+        visible: !root.modelData?.isSeparator
+        rootMenu: root.rootMenu
+        menuData: root.modelData
+        Layout.fillWidth: true
+        onInteracted: root.interacted()
+    }
+}