Rewrite <TimelineHint /> as FC and TS (#25091)

app/javascript/mastodon/components/timeline_hint.tsx

@@ -0,0 +1,27 @@
+import React from 'react';
+
+import { FormattedMessage } from 'react-intl';
+
+interface Props {
+  resource: JSX.Element;
+  url: string;
+}
+
+export const TimelineHint: React.FC<Props> = ({ resource, url }) => (
+  <div className='timeline-hint'>
+    <strong>
+      <FormattedMessage
+        id='timeline_hint.remote_resource_not_displayed'
+        defaultMessage='{resource} from other servers are not displayed.'
+        values={{ resource }}
+      />
+    </strong>
+    <br />
+    <a href={url} target='_blank' rel='noopener noreferrer'>
+      <FormattedMessage
+        id='account.browse_more_on_origin_server'
+        defaultMessage='Browse more on the original profile'
+      />
+    </a>
+  </div>
+);