Implemented confi snapshots

web/src/Canvas.tsx

@@ -16,6 +16,7 @@ import Button from './widgets/Button';
 import PlotWidget from './widgets/PlotWidget';
 import ImageWidget from './widgets/ImageWidget';
 import LinkWidget from './widgets/LinkWidget';
+import ConfigSelect from './widgets/ConfigSelect';
 import ContextMenu from './ContextMenu';
 import InfoPanel from './InfoPanel';
 import SplitLayout from './SplitLayout';
@@ -34,6 +35,7 @@ const COMPONENTS: Record<string, any> = {
   plot:      PlotWidget,
   image:     ImageWidget,
   link:      LinkWidget,
+  configselect: ConfigSelect,
 };
 
 interface CtxState {