message: different display classes for wallet card and account cards
diff: <div uk-grid>
  <div class="uk-width-expand">
  - <div [class]="[ 'nav-nano-card', true ? 'is-wallet' : '' ]">
  + <div [class]="[ 'nav-nano-card', (wallet.selectedAccount === null) ? 'is-wallet' : 'is-card' ]">
  <div class="logo"></div>
  <div class="card-contents">
  <div class="account-name-container">
  