Disable timespan controls while isLoading

frontend/src/app/components/hashrates-chart-pools/hashrate-chart-pools.component.html

@@ -11,7 +11,7 @@
     </div>  
 
     <form [formGroup]="radioGroupForm" class="formRadioGroup" *ngIf="(hashrateObservable$ | async) as stats">
-      <div class="btn-group btn-group-toggle" name="radioBasic">
+      <div class="btn-group btn-group-toggle" name="radioBasic" [class]="{'disabled': isLoading}">
         <label class="btn btn-primary btn-sm" *ngIf="stats.blockCount >= 25920" [class.active]="radioGroupForm.get('dateSpan').value === '6m'">
           <input type="radio" [value]="'6m'" fragment="6m" [routerLink]="['/graphs/mining/pools-dominance' | relativeUrl]" [attr.data-cy]="'6m'" formControlName="dateSpan"> 6M
         </label>

frontend/src/app/components/hashrates-chart-pools/hashrate-chart-pools.component.scss

@@ -82,3 +82,8 @@
 .loadingGraphs.widget {
   top: 75%;
 }
+
+.disabled {
+  pointer-events: none;
+  opacity: 0.5;
+}