message: Add to progress-icon usage fields
diff: import Component from '@glimmer/component';
  -
  +import { tracked } from '@glimmer/tracking';
  export default class extends Component {
  - fractionComplete = 0.4;
  - size = 24;
  - isCancelled = false;
  - isComplete = false;
  + @tracked fractionComplete = 0.4;
  + @tracked size = 24;
  + @tracked isCancelled = false;
  + @tracked isComplete = false;
  }
  