Add setting to disable hover cards (#30931)

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

app/javascript/mastodon/features/ui/index.jsx

@@ -25,7 +25,7 @@ import { clearHeight } from '../../actions/height_cache';
 import { expandNotifications } from '../../actions/notifications';
 import { fetchServer, fetchServerTranslationLanguages } from '../../actions/server';
 import { expandHomeTimeline } from '../../actions/timelines';
-import initialState, { me, owner, singleUserMode, trendsEnabled, trendsAsLanding } from '../../initial_state';
+import initialState, { me, owner, singleUserMode, trendsEnabled, trendsAsLanding, disableHoverCards } from '../../initial_state';
 
 import BundleColumnError from './components/bundle_column_error';
 import Header from './components/header';
@@ -588,7 +588,7 @@ class UI extends PureComponent {
 
           {layout !== 'mobile' && <PictureInPicture />}
           <NotificationsContainer />
-          <HoverCardController />
+          {!disableHoverCards && <HoverCardController />}
           <LoadingBarContainer className='loading-bar' />
           <ModalContainer />
           <UploadArea active={draggingOver} onClose={this.closeUploadModal} />