Use new Kirigami builtin column resize handle

Use the new Kirigami.ColumnView.interactiveResizeEnabled attached property
which allows to have a built in resize handle for ColumnView pages
removing the need for a custom handle with resize logic

depends from https://invent.kde.org/frameworks/kirigami/-/merge_requests/1795

src/app/qml/Main.qml

@@ -41,6 +41,7 @@ Kirigami.ApplicationWindow {
             showExisting: true
             onConnectionChosen: root.load()
         }
+        columnView.columnResizeMode: pageStack.wideMode ? Kirigami.ColumnView.DynamicColumns : Kirigami.ColumnView.SingleColumn
         globalToolBar.canContainHandles: true
         globalToolBar {
             style: Kirigami.ApplicationHeaderStyle.ToolBar