feat: pin frequent mobile work (Closes #1477)

frontend/index.html

@@ -2183,9 +2183,13 @@
       <p class="small muted" id="mobile-queue-next-heading">Start / Continue</p>
       <button id="mobile-queue-next-action" type="button">Find Work</button>
     </section>
+    <p id="mobile-recent-work-status" role="status" aria-live="polite" class="small"></p>
+    <section class="mobile-queue-group" id="mobile-pinned-work" aria-labelledby="mobile-pinned-work-heading" hidden>
+      <h3 id="mobile-pinned-work-heading">Pinned work</h3>
+      <div class="mobile-queue-list" id="mobile-pinned-work-list"></div>
+    </section>
     <section class="mobile-queue-group" id="mobile-recent-work" aria-labelledby="mobile-recent-work-heading" hidden>
       <h3 id="mobile-recent-work-heading">Recent work</h3>
-      <p id="mobile-recent-work-status" role="status" aria-live="polite" class="small"></p>
       <div class="mobile-queue-list" id="mobile-recent-work-list"></div>
     </section>
     <details class="mobile-queue-priority" id="mobile-queue-priority">