feat: continue through mobile search results (Closes #801)

frontend/index.html

@@ -466,6 +466,11 @@
     <div id="search-preview-meta" class="row"></div>
     <div id="search-preview-body" class="search-preview-body markdown-content"></div>
     <div class="search-preview-actions">
+      <nav class="search-preview-navigation" aria-label="Search result navigation" hidden>
+        <button id="previous-search-result" type="button">Previous</button>
+        <span id="search-preview-position" aria-live="polite"></span>
+        <button id="next-search-result" type="button">Next</button>
+      </nav>
       <div class="search-preview-primary-actions">
         <button id="claim-search-result" type="button" hidden>Assign to me</button>
         <button id="defer-search-result" type="button" hidden>Assign &amp; defer</button>