AppChooser portal: port from MouseArea to HoverHandler/TapHander

These are lighter weight and more future-proof.

src/AppChooserDialog.qml

@@ -90,6 +90,14 @@ PWD.SystemDialog
             height: grid.cellHeight
             width: grid.cellWidth
 
+            HoverHandler {
+                acceptedButtons: Qt.NoButton
+                cursorShape: hovered ? Qt.PointingHandCursor : Qt.ArrowCursor
+            }
+            TapHandler {
+                onTapped: AppChooserData.applicationSelected(model.applicationDesktopFile)
+            }
+
             Rectangle {
                 anchors.fill: parent
                 color: Kirigami.Theme.highlightColor
@@ -97,15 +105,6 @@ PWD.SystemDialog
                 radius: 2
             }
 
-            MouseArea {
-                id: mouseArea
-                anchors.fill: parent
-                hoverEnabled: true
-
-                onContainsMouseChanged: cursorShape = containsMouse ? Qt.PointingHandCursor : Qt.ArrowCursor
-                onClicked: AppChooserData.applicationSelected(model.applicationDesktopFile)
-            }
-
             Column {
                 anchors.fill: parent
                 anchors.margins: Kirigami.Units.gridUnit / 2