feat: surface mobile device readiness (Closes #559)

frontend/index.html

@@ -146,6 +146,17 @@
         </div>
       </details>
     </div>
+    <section class="device-readiness-card" id="device-readiness-card" aria-labelledby="device-readiness-heading" hidden>
+      <div>
+        <strong id="device-readiness-heading">Make this phone work-ready</strong>
+        <p class="small muted">Install, save work offline, and enable update alerts.</p>
+        <p class="small device-readiness-summary" id="device-readiness-summary" role="status" aria-live="polite"></p>
+      </div>
+      <div class="device-readiness-actions">
+        <button id="finish-device-setup" type="button">Finish setup</button>
+        <button id="dismiss-device-readiness" type="button">Not now</button>
+      </div>
+    </section>
     <div class="update-selection-controls" id="update-selection-controls" hidden>
       <button id="select-updates" type="button">Select updates</button>
       <button id="cancel-update-selection" type="button" hidden>Cancel selection</button>