Panels: improvements

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

Modules/Panels/Bluetooth/BluetoothPanel.qml

@@ -12,13 +12,16 @@ import qs.Modules.MainScreen
 SmartPanel {
   id: root
 
-  preferredWidth: 420 * Style.uiScaleRatio
+  preferredWidth: Math.round(340 * Style.uiScaleRatio)
   preferredHeight: 500 * Style.uiScaleRatio
 
   panelContent: Rectangle {
     color: Color.transparent
 
+    property real contentPreferredHeight: Math.min(preferredHeight, Math.max(240, mainColumn.implicitHeight + Style.marginL * 2))
+
     ColumnLayout {
+      id: mainColumn
       anchors.fill: parent
       anchors.margins: Style.marginL
       spacing: Style.marginM
@@ -92,7 +95,7 @@ SmartPanel {
 
           NIcon {
             icon: "bluetooth-off"
-            pointSize: 64
+            pointSize: 48
             color: Color.mOnSurfaceVariant
             Layout.alignment: Qt.AlignHCenter
           }