fix: reconcile concurrent Draft saves (Closes #857)

frontend/index.html

@@ -252,6 +252,7 @@
     <div class="small" id="notification-page-status" aria-live="polite"></div>
     <button class="load-more-notifications" id="load-more-notifications" type="button" hidden>Load older updates</button>
     <div class="small" id="my-work-action-status" aria-live="assertive"></div>
+    <button class="retry-work-route" id="retry-unfiled-draft-sync" type="button" hidden>Retry Draft sync</button>
     <div class="small" id="today-sync-status" aria-live="polite">Today is saved on this device.</div>
     <div class="small" id="later-sync-status" aria-live="polite">Later is saved on this device.</div>
     <button class="retry-work-route" id="retry-work-route" type="button" hidden>Retry shared work item</button>