show image in dashboard

pdb-js/src/app/dashboard.service.ts

@@ -53,4 +53,8 @@ export class PlotWidget extends BaseWidget {
   constructor(override size: 'SMALL'|'MEDIUM'|'LARGE', public config: PlotConfig) {
     super('PLOT', size);
   }
+}
+
+export class WidgetDimensions{
+  constructor(public width: number, public height: number){}
 }