NPanel: restore outter border on panels without sexy borders + minor polishing.

Widgets/NPanel.qml

@@ -554,6 +554,7 @@ Loader {
           color: Color.transparent
           border.color: Color.mPrimary
           border.width: Style.borderM
+          radius: Style.radiusL
           visible: panelBackground.isDragged && dragHandler.active
           opacity: 0.8
           z: 3000
@@ -565,6 +566,7 @@ Loader {
             color: Color.transparent
             border.color: Color.mPrimary
             border.width: Style.borderS
+            radius: Style.radiusL
             opacity: 0.3
           }
         }

Widgets/NRectangleCurved.qml

@@ -42,6 +42,8 @@ Item {
     anchors.fill: parent
     color: root.backgroundColor
     radius: topLeftRadius // Use topLeftRadius as default
+    border.width: Style.borderS
+    border.color: Color.mOutline
     visible: !root.hasInvertedCorners
 
     topLeftRadius: root.topLeftRadius