Add lightning node link previews

frontend/src/app/lightning/nodes-channels-map/nodes-channels-map.component.html

@@ -1,4 +1,4 @@
-<div [class]="'full-container ' + style">
+<div [class]="'full-container ' + style + (fitContainer ? ' fit-container' : '')">
 
   <div *ngIf="style === 'graph'" class="card-header">
     <div class="d-flex d-md-block align-items-baseline" style="margin-bottom: -5px">
@@ -8,7 +8,7 @@
   </div>
 
   <div *ngIf="observable$ | async" class="chart" echarts [initOpts]="chartInitOptions" [options]="chartOptions"
-    (chartInit)="onChartInit($event)">
+    (chartInit)="onChartInit($event)" (chartFinished)="onChartFinished($event)">
   </div>
 
 </div>