sync check failure is now shown as error message in frontend

public/javascripts/messaging.js

@@ -42,6 +42,9 @@ const messaging = (function() {
 
             changesToPushCountEl.html(message.changesToPushCount);
         }
+        else if (message.type === 'sync-hash-check-failed') {
+            showError("Sync check failed!", 60000);
+        }
     }
 
     function connectWebSocket() {

public/javascripts/utils.js

@@ -17,7 +17,7 @@ function showMessage(message) {
     });
 }
 
-function showError(message) {
+function showError(message, delay = 10000) {
     console.log("error: ", message);
 
     $.notify({
@@ -26,7 +26,7 @@ function showError(message) {
     },{
         // settings
         type: 'danger',
-        delay: 10000
+        delay: delay
     });
 }