Column: remove top gap on mobile, implement pulling feedback

app/soapbox/components/pullable.js

@@ -0,0 +1,34 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import PullToRefresh from 'react-simple-pull-to-refresh';
+
+/**
+ * Pullable:
+ * Basic "pull to refresh" without the refresh.
+ * Just visual feedback.
+ */
+export default class Pullable extends React.Component {
+
+  static propTypes = {
+    children: PropTypes.node.isRequired,
+  }
+
+  handleRefresh = () => {
+    return new Promise(resolve => resolve());
+  }
+
+  render() {
+    const { children } = this.props;
+
+    return (
+      <PullToRefresh
+        onRefresh={this.handleRefresh}
+        pullingContent={null}
+        refreshingContent={null}
+      >
+        {children}
+      </PullToRefresh>
+    );
+  }
+
+}