Switch all direct sat/vb fields to new rate component

frontend/src/app/components/transaction/transaction-preview.component.html

@@ -33,7 +33,7 @@
         <span [innerHTML]="'&lrm;' + (tx.weight | wuBytes: 2)"></span>
       </p>
       <p class="field" *ngIf="!isCoinbase(tx)">
-        {{ tx.feePerVsize | feeRounding }} <span class="symbol" i18n="shared.sat-vbyte|sat/vB">sat/vB</span>
+        <app-fee-rate [fee]="tx.feePerVsize"></app-fee-rate>
       </p>
     </div>
     <div class="overlaid">