Add window title and icon

ui/app-window.slint

@@ -18,6 +18,9 @@ export component AppWindow inherits Window {
     out property <length> window-height: self.height;
     out property <View> view: View.Timeline;
 
+    title: "immich-rs";
+    icon: @image-url("../assets/immich-logo.svg");
+
     // Do not base preferred-width on children
     preferred-width: 480px;