feat: reassign delegated filings from mobile Filed (Closes #895)

frontend/index.html

@@ -689,7 +689,7 @@
       </fieldset>
     </details>
     <details class="issue-handoff" id="issue-handoff">
-      <summary>Hand off to teammate</summary>
+      <summary id="issue-handoff-summary">Hand off to teammate</summary>
       <div>
         <button id="load-issue-handoff" type="button">Choose teammate</button>
         <label for="issue-handoff-recipient" class="small">Eligible repository assignee</label>