Use Immutable Record for accounts in Redux state (#26559)

app/javascript/mastodon/features/compose/components/action_bar.jsx

@@ -28,7 +28,7 @@ const messages = defineMessages({
 class ActionBar extends PureComponent {
 
   static propTypes = {
-    account: ImmutablePropTypes.map.isRequired,
+    account: ImmutablePropTypes.record.isRequired,
     onLogout: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
   };

app/javascript/mastodon/features/compose/components/autosuggest_account.jsx

@@ -7,7 +7,7 @@ import { DisplayName } from '../../../components/display_name';
 export default class AutosuggestAccount extends ImmutablePureComponent {
 
   static propTypes = {
-    account: ImmutablePropTypes.map.isRequired,
+    account: ImmutablePropTypes.record.isRequired,
   };
 
   render () {

app/javascript/mastodon/features/compose/components/navigation_bar.jsx

@@ -14,7 +14,7 @@ import ActionBar from './action_bar';
 export default class NavigationBar extends ImmutablePureComponent {
 
   static propTypes = {
-    account: ImmutablePropTypes.map.isRequired,
+    account: ImmutablePropTypes.record.isRequired,
     onLogout: PropTypes.func.isRequired,
     onClose: PropTypes.func,
   };