Better default size for ApplicationWindow

harmonyqml/components/UI.qml

@@ -27,7 +27,7 @@ Controls1.SplitView {
         onCurrentItemChanged: currentItem.forceActiveFocus()
 
         initialItem: Item {  // TODO: (test, remove)
-            Keys.onPressed: pageStack.showRoom(
+            Keys.onEnterPressed: pageStack.showRoom(
                 "@test_mary:matrix.org", "!TSXGsbBbdwsdylIOJZ:matrix.org"
                 //"@test_mary:matrix.org", "!TEXkdeErtVCMqClNfb:matrix.org"
             )

harmonyqml/components/Window.qml

@@ -1,10 +1,11 @@
 import QtQuick 2.7
 import QtQuick.Controls 2.2
+import QtQuick.Window 2.7
 
 ApplicationWindow {
     visible: true
-    width: 640
-    height: 700
+    width: Math.min(Screen.width, 1152)
+    height: Math.min(Screen.height, 768)
 
     Loader {
         anchors.fill: parent