Added NCheckbox and used it for Matugen templates

NCheckbox: Added
ColorSchemeTab: replace NToggle with NCheckbox

Widgets/NCheckbox.qml

@@ -0,0 +1,72 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import qs.Commons
+
+RowLayout {
+  id: root
+
+  // Public API (mirrors NToggle but compact)
+  property string label: ""
+  property string description: ""
+  property bool checked: false
+  property bool hovering: false
+  // Smaller default footprint than NToggle
+  property int baseSize: Math.max(Style.baseWidgetSize * 0.8, 14)
+
+  signal toggled(bool checked)
+  signal entered
+  signal exited
+
+  Layout.fillWidth: true
+
+  NLabel {
+    label: root.label
+    description: root.description
+  }
+
+  Rectangle {
+    id: box
+
+    implicitWidth: root.baseSize * scaling
+    implicitHeight: root.baseSize * scaling
+    radius: Math.max(2 * scaling, Style.radiusXS * scaling)
+    color: root.checked ? Color.mPrimary : Color.mSurface
+    border.color: root.checked ? Color.mPrimary : Color.mOutline
+    border.width: Math.max(1, Style.borderM * scaling)
+
+    NIcon {
+      visible: root.checked
+      anchors.centerIn: parent
+      text: "check"
+      color: Color.mOnPrimary
+      font.pointSize: Math.max(Style.fontSizeS, root.baseSize * 0.7) * scaling
+    }
+
+    MouseArea {
+      anchors.fill: parent
+      cursorShape: Qt.PointingHandCursor
+      hoverEnabled: true
+      onEntered: {
+        hovering = true
+        root.entered()
+      }
+      onExited: {
+        hovering = false
+        root.exited()
+      }
+      onClicked: root.toggled(!root.checked)
+    }
+
+    Behavior on color {
+      ColorAnimation {
+        duration: Style.animationFast
+      }
+    }
+    Behavior on border.color {
+      ColorAnimation {
+        duration: Style.animationFast
+      }
+    }
+  }
+}