Check heart status by localStorage not class

public/assets/enhancements.js

@@ -74,17 +74,13 @@
         var nodeIndex = heartedNodes.indexOf(node);
 
         // Heart/unheart node
-        if(heartEl.classList.contains('hearted')) {
-          heartEl.classList.remove('hearted');
         if(nodeIndex > -1) {
+          heartEl.classList.remove('hearted');
           heartedNodes.splice(nodeIndex, 1);
-          }
         } else {
           heartEl.classList.add('hearted');
-          if(nodeIndex == -1) {
           heartedNodes.push(node);
         }
-        }
 
         // Save new heartedNodes
         localStorage.setItem(storageKey, JSON.stringify(heartedNodes));