New notification cleaning mode (#89)

This PR adds a new notification cleaning mode, super perfectly tuned for accessibility, and removes the previous notification cleaning functionality as it's now redundant.

* w.i.p. notif clearing mode

* Better CSS for selected notification and shorter text if Stretch is off

* wip for rebase ~

* all working in notif clearing mode, except the actual removal

* bulk delete route for piggo

* cleaning + refactor. endpoint gives 422 for some reason

* formatting

* use the right route

* fix broken destroy_multiple

* load more notifs after succ cleaning

* satisfy eslint

* Removed CSS for the old notif delete button

* Tabindex=0 is mandatory

In order to make it possible to tab to this element you must have tab index = 0. Removing this violates WCAG and makes it impossible to use the interface without good eyesight and a mouse. So nobody with certain mobility impairments, vision impairments, or brain injuries would be able to use this feature if you don't have tabindex=0

* Corrected aria-label

Previous label implied a different behavior from what actually happens

* aria role localization & made the overlay behave like a checkbox

* checkboxes css and better contrast

* color tuning for the notif overlay

* fanceh checkboxes etc and nice backgrounds

* SHUT UP TRAVIS

app/javascript/glitch/components/notification/overlay/notification_overlay.js

@@ -0,0 +1,59 @@
+/**
+ * Notification overlay
+ */
+
+
+//  Package imports  //
+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import PropTypes from 'prop-types';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import { defineMessages, injectIntl } from 'react-intl';
+
+//  Mastodon imports  //
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+const messages = defineMessages({
+  markForDeletion: { id: 'notification.markForDeletion', defaultMessage: 'Mark for deletion' },
+});
+
+@injectIntl
+export default class NotificationOverlay extends ImmutablePureComponent {
+
+  static propTypes = {
+    notification    : ImmutablePropTypes.map.isRequired,
+    onMarkForDelete : PropTypes.func.isRequired,
+    revealed        : PropTypes.bool.isRequired,
+    intl            : PropTypes.object.isRequired,
+  };
+
+  onToggleMark = () => {
+    const mark = !this.props.notification.get('markedForDelete');
+    const id = this.props.notification.get('id');
+    this.props.onMarkForDelete(id, mark);
+  }
+
+  render () {
+    const { notification, revealed, intl } = this.props;
+
+    const active = notification.get('markedForDelete');
+    const label = intl.formatMessage(messages.markForDeletion);
+
+    return (
+      <div
+        aria-label={label}
+        role='checkbox'
+        aria-checked={active}
+        tabIndex={0}
+        className={`notification__dismiss-overlay ${active ? 'active' : ''} ${revealed ? 'show' : ''}`}
+        onClick={this.onToggleMark}
+      >
+        <div className='notification__dismiss-overlay__ckbox' aria-hidden='true' title={label}>
+          {active ? (<i className='fa fa-check' />) : ''}
+        </div>
+      </div>
+    );
+  }
+
+}