Added a Spacer widget so people can add spacing between other widgets

(as requested in ##226).
Spacer: create variable width invisible rectangle
BarWidgetSettingsDialog: add Spacer support
BarWidgetRegistry: add Spacer

Modules/Bar/Widgets/Spacer.qml

@@ -0,0 +1,56 @@
+import QtQuick
+import QtQuick.Layouts
+import Quickshell
+import qs.Commons
+import qs.Services
+import qs.Widgets
+
+Item {
+  id: root
+
+  // Widget properties passed from Bar.qml
+  property var screen
+  property real scaling: 1.0
+
+  property string barSection: ""
+  property int sectionWidgetIndex: -1
+  property int sectionWidgetsCount: 0
+
+  // Get user settings from Settings data - make it reactive
+  property var widgetSettings: {
+    var section = barSection.replace("Section", "").toLowerCase()
+    if (section && sectionWidgetIndex >= 0) {
+      var widgets = Settings.data.bar.widgets[section]
+      if (widgets && sectionWidgetIndex < widgets.length) {
+        return widgets[sectionWidgetIndex]
+      }
+    }
+    return {}
+  }
+
+  // Use settings or defaults from BarWidgetRegistry
+  readonly property int userWidth: {
+    var section = barSection.replace("Section", "").toLowerCase()
+    if (section && sectionWidgetIndex >= 0) {
+      var widgets = Settings.data.bar.widgets[section]
+      if (widgets && sectionWidgetIndex < widgets.length) {
+        return widgets[sectionWidgetIndex].width || BarWidgetRegistry.widgetMetadata["Spacer"].width
+      }
+    }
+    return BarWidgetRegistry.widgetMetadata["Spacer"].width
+  }
+
+  // Set the width based on user settings
+  implicitWidth: userWidth * scaling
+  implicitHeight: Style.barHeight * scaling
+  width: implicitWidth
+  height: implicitHeight
+
+  // Optional: Add a subtle visual indicator in debug mode
+  Rectangle {
+    anchors.fill: parent
+    color: Qt.rgba(1, 0, 0, 0.1) // Very subtle red tint
+    visible: Settings.data.general.debugMode || false
+    radius: 2 * scaling
+  }
+}