SettingsTabs: use NHeader, move display settings around

Widgets/NHeader.qml

@@ -0,0 +1,33 @@
+import QtQuick
+import QtQuick.Layouts
+import qs.Commons
+
+ColumnLayout {
+  id: root
+
+  property string title: ""
+  property string description: ""
+  property real bottomMargin: Style.marginL * scaling
+
+  spacing: Style.marginXXS * scaling
+  Layout.fillWidth: true
+
+  NText {
+    text: root.title
+    font.pointSize: Style.fontSizeXXL * scaling
+    font.weight: Style.fontWeightBold
+    color: Color.mSecondary
+    Layout.bottomMargin: Style.marginS * scaling
+    visible: root.title !== ""
+  }
+
+  NText {
+    text: root.description
+    font.pointSize: Style.fontSizeM * scaling
+    color: Color.mOnSurfaceVariant
+    wrapMode: Text.WordWrap
+    Layout.fillWidth: true
+    Layout.bottomMargin: root.bottomMargin
+    visible: root.description !== ""
+  }
+}