Add explore page to web UI (#17123)

* Add explore page to web UI

* Fix not removing loaded statuses from trends on mute/block action

app/javascript/mastodon/features/explore/components/story.js

@@ -0,0 +1,51 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import Blurhash from 'mastodon/components/blurhash';
+import { accountsCountRenderer } from 'mastodon/components/hashtag';
+import ShortNumber from 'mastodon/components/short_number';
+import Skeleton from 'mastodon/components/skeleton';
+import classNames from 'classnames';
+
+export default class Story extends React.PureComponent {
+
+  static propTypes = {
+    url: PropTypes.string,
+    title: PropTypes.string,
+    publisher: PropTypes.string,
+    sharedTimes: PropTypes.number,
+    thumbnail: PropTypes.string,
+    blurhash: PropTypes.string,
+  };
+
+  state = {
+    thumbnailLoaded: false,
+  };
+
+  handleImageLoad = () => this.setState({ thumbnailLoaded: true });
+
+  render () {
+    const { url, title, publisher, sharedTimes, thumbnail, blurhash } = this.props;
+
+    const { thumbnailLoaded } = this.state;
+
+    return (
+      <a className='story' href={url} target='blank' rel='noopener'>
+        <div className='story__details'>
+          <div className='story__details__publisher'>{publisher ? publisher : <Skeleton width={50} />}</div>
+          <div className='story__details__title'>{title ? title : <Skeleton />}</div>
+          <div className='story__details__shared'>{typeof sharedTimes === 'number' ? <ShortNumber value={sharedTimes} renderer={accountsCountRenderer} /> : <Skeleton width={100} />}</div>
+        </div>
+
+        <div className='story__thumbnail'>
+          {thumbnail ? (
+            <React.Fragment>
+              <div className={classNames('story__thumbnail__preview', { 'story__thumbnail__preview--hidden': thumbnailLoaded })}><Blurhash hash={blurhash} /></div>
+              <img src={thumbnail} onLoad={this.handleImageLoad} alt='' role='presentation' />
+            </React.Fragment>
+          ) : <Skeleton />}
+        </div>
+      </a>
+    );
+  }
+
+}