Updated all basic components

removed unnecessary components, combined where necessary
added each component to a folder, added individual css style modules
optimized some component rendering flows
removed functional components in favor of pure components
linted and formatted all of the files

app/javascript/gabsocial/components/timeline_queue_button_header/index.js

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+import { FormattedMessage } from 'react-intl';
+import classNames from 'classnames';
+import { shortNumberFormat } from '../../utils/numbers';
+
+import './index.scss';
+
+export default class TimelineQueueButtonHeader extends PureComponent {
+
+  static propTypes = {
+    onClick: PropTypes.func.isRequired,
+    count: PropTypes.number,
+    itemType: PropTypes.string,
+  };
+
+  static defaultProps = {
+    count: 0,
+    itemType: 'item',
+  };
+
+  render () {
+    const { count, itemType, onClick } = this.props;
+
+    const hasItems = (count > 0);
+
+    const classes = classNames('timeline-queue-header', {
+      'timeline-queue-header--extended': hasItems,
+    });
+
+    return (
+      <div className={classes}>
+        <a className='timeline-queue-header__btn' onClick={onClick}>
+          {
+            hasItems &&
+            <FormattedMessage
+              id='timeline_queue.label'
+              defaultMessage='{count} new {type}'
+              values={{
+                count: shortNumberFormat(count),
+                type: count === 1 ? itemType : `${itemType}s`,
+              }}
+            />
+          }
+        </a>
+      </div>
+    );
+  }
+
+}

app/javascript/gabsocial/components/timeline_queue_button_header/index.scss

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+.timeline-queue-header {
+  display: block;
+  width: 100%;
+  max-height: 0px;
+  position: relative;
+  background-color: darken($ui-base-color, 8%);
+  border-bottom: 1px solid;
+  border-top: 1px solid;
+  border-color: darken($ui-base-color, 4%);
+  transition: max-height 2.5s ease;
+  overflow: hidden;
+
+  &--extended {
+    max-height: 46px;
+  }
+
+  &__btn {
+    display: block;
+    cursor: pointer;
+    color: $secondary-text-color;
+
+    @include size(100%);
+    @include text-sizing(14px, 400, 46px, center);
+
+    span {
+      height: 46px;
+    }
+  }
+}