feat: configure deadline reminder time in device setup (Closes #715)

frontend/index.html

@@ -82,6 +82,14 @@
         <div><strong>Notify me about new updates</strong><p class="small" id="device-setup-push-status" role="status"></p></div>
         <button class="device-setup-action" id="device-setup-push" type="button">Enable</button>
       </li>
+      <li class="device-setup-step">
+        <div><strong>Remind me about deadlines</strong><p class="small" id="device-setup-deadline-status" role="status"></p></div>
+        <div class="device-setup-deadline-controls">
+          <label for="device-setup-deadline-hour">Local hour</label>
+          <select id="device-setup-deadline-hour" aria-label="Deadline reminder local hour"></select>
+          <button class="device-setup-action" id="device-setup-deadline" type="button">Enable</button>
+        </div>
+      </li>
     </ol>
     <p id="device-setup-ready-status" class="device-setup-ready" role="status" aria-live="polite"></p>
   </section>
@@ -130,6 +138,7 @@
             <label class="push-update-control" for="push-updates"><input id="push-updates" type="checkbox" /> Notify me about new updates</label>
             <span class="small" id="push-update-status" role="status" aria-live="polite"></span>
             <label class="push-update-control" for="push-deadlines"><input id="push-deadlines" type="checkbox" /> Notify me about deadlines</label>
+            <label for="push-deadline-hour">Reminder hour <select id="push-deadline-hour" aria-label="Deadline reminder local hour"></select></label>
             <span class="small" id="push-deadline-status" role="status" aria-live="polite"></span>
             <button id="clear-offline-work" type="button">Clear offline work data</button>
             <button id="retry-offline-storage" type="button" hidden>Retry offline saving</button>