feat: complete mobile Filed follow-up (Closes #874)

frontend/index.html

@@ -1214,6 +1214,7 @@
       <button data-mobile-queue="agenda" type="button"><span><strong>Agenda</strong><small>Upcoming deadlines</small></span><span data-mobile-queue-count="agenda">0</span></button>
       <button data-mobile-queue="attention" type="button"><span><strong>Attention</strong><small>Needs a response</small></span><span data-mobile-queue-count="attention">0</span></button>
       <button data-mobile-queue="update" type="button" aria-label="Updates, 0 unread conversations"><span><strong>Updates</strong><small>Unread conversations</small></span><span data-mobile-queue-count="update">0</span></button>
+      <button data-mobile-queue="filed" type="button"><span><strong>Filed</strong><small>Issues you delegated</small></span><span data-mobile-queue-count="filed">0</span></button>
       <button data-mobile-queue="later" type="button"><span><strong>Later</strong><small>Deferred work</small></span><span data-mobile-queue-count="later">0</span></button>
       <button data-mobile-queue="draft" type="button"><span><strong>Drafts</strong><small>Unfiled captures</small></span><span data-mobile-queue-count="draft">0</span></button>
       <button data-mobile-queue="find" type="button"><span><strong>Find Work</strong><small>Claim something new</small></span></button>