Panels: improvements

- slightly smaller and more homogenous sizing
- better look for battery panel (icons)

Modules/Panels/Battery/BatteryPanel.qml

@@ -59,19 +59,33 @@ SmartPanel {
 
   Component {
     id: disabledComponent
-    NText {
-      text: I18n.tr("battery.panel.disabled")
-      pointSize: Style.fontSizeL
-      color: Color.mOnSurfaceVariant
-      wrapMode: Text.WordWrap
-      horizontalAlignment: Text.AlignHCenter
+
+    ColumnLayout {
+      anchors.centerIn: parent
+      spacing: Style.marginM
+
+      NIcon {
+        icon: "recharging"
+        pointSize: 48
+        color: Color.mOnSurfaceVariant
+        Layout.alignment: Qt.AlignHCenter
+      }
+
+      NText {
+        text: I18n.tr("battery.panel.disabled")
+        pointSize: Style.fontSizeL
+        color: Color.mOnSurfaceVariant
+        wrapMode: Text.WordWrap
+        Layout.alignment: Qt.AlignHCenter
+      }
     }
   }
 
   panelContent: Item {
     anchors.fill: parent
-    property real contentPreferredHeight: mainLayout.implicitHeight + Style.marginM * 2
-    property real contentPreferredWidth: 350 * Style.uiScaleRatio
+
+    property real contentPreferredWidth: Math.round(340 * Style.uiScaleRatio)
+    property real contentPreferredHeight: Math.round(mainLayout.implicitHeight + Style.marginM * 2)
 
     ColumnLayout {
       id: mainLayout
@@ -91,6 +105,12 @@ SmartPanel {
           anchors.margins: Style.marginM
           spacing: Style.marginM
 
+          NIcon {
+            icon: "battery-4"
+            pointSize: Style.fontSizeXXL
+            color: Color.mPrimary
+          }
+
           NText {
             text: I18n.tr("battery.panel.title")
             pointSize: Style.fontSizeL