Key derivation in Worker (#4071)

* Add Signer Key Derivation in Service Worker

* Several fixes throughout the UI

* Hint for external account // working Worker

* Add Worker state change

* PR Grumbles

js/src/ui/MethodDecoding/methodDecoding.js

@@ -196,7 +196,7 @@ class MethodDecoding extends Component {
       : text.slice(0, 50) + '...';
 
     return (
-      <div>
+      <div className={ styles.details }>
         <span>with the </span>
         <span
           onClick={ this.toggleInputType }