Improve toot clicking areas (#13327)

* Make the area to the left “Show Thread” also expand the toot in Web UI

* Clicking the left part of a conversation with the avatars now opens it in Web UI

app/javascript/mastodon/features/direct_timeline/components/conversation.js

@@ -160,7 +160,7 @@ class Conversation extends ImmutablePureComponent {
     return (
       <HotKeys handlers={handlers}>
         <div className={classNames('conversation focusable muted', { 'conversation--unread': unread })} tabIndex='0'>
-          <div className='conversation__avatar'>
+          <div className='conversation__avatar' onClick={this.handleClick} role='presentation'>
             <AvatarComposite accounts={accounts} size={48} />
           </div>