feat: sync Today blockers offline (Closes #533)

frontend/index.html

@@ -729,6 +729,7 @@
 <script src="static/issue-outbox.js"></script>
 <script src="static/authored-outbox.js"></script>
 <script src="static/offline-issue-close.js"></script>
+<script src="static/offline-issue-blocker.js"></script>
 <script src="static/notification-read-outbox.js"></script>
 <script src="static/offline-work.js"></script>
 <script src="static/offline-today.js"></script>