style for kanban 'tools toggle' and notes for later

www/kanban/app-kanban.less

@@ -353,6 +353,8 @@
     }
 
     #cp-kanban-controls {
+        //background-color: fade(@toolbar-bg-color-active, 50%); // FIXME ?
+        //color: @cp_toolbar-fg;
         padding: 10px;
         display: flex;
         position: relative;

www/kanban/inner.js

@@ -1009,9 +1009,13 @@ define([
             var common = framework._.sfCommon;
             var $button = common.createButton('toggle', true, {
                 element: $(container),
+                //icon: 'fa-tags', // FIXME
+                //text: Messages.fm_tagsName, // FIXME
             }, function () {
+                $button.toggleClass('cp-toolbar-button-active');
 
             });
+            $button.addClass('cp-toolbar-button-active');
             framework._.toolbar.$bottomL.append($button);
 
             onRedraw.reg(function () {