Add "Pro" stub for Static IP feature (#1675)

Resolves #1673



https://github.com/tiny-pilot/tinypilot/assets/6730025/27a4b1ed-b104-4151-a391-9c7c1468101b


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Author: jdeanwallace

app/static/js/app.js

@@ -329,6 +329,9 @@ menuBar.addEventListener("mass-storage-dialog-requested", () => {
 menuBar.addEventListener("wake-on-lan-dialog-requested", () => {
   document.getElementById("feature-pro-overlay").show();
 });
+menuBar.addEventListener("static-ip-dialog-requested", () => {
+  document.getElementById("feature-pro-overlay").show();
+});
 menuBar.addEventListener("video-settings-dialog-requested", () => {
   document.getElementById("video-settings-dialog").initialize();
   document.getElementById("video-settings-overlay").show();

app/templates/custom-elements/menu-bar.html

@@ -203,6 +203,11 @@
                 >Hostname</a
               >
             </li>
+            <li class="item pro-badge" role="presentation">
+              <a data-onclick-event="static-ip-dialog-requested" role="menuitem"
+                >Static IP</a
+              >
+            </li>
           </ul>
         </li>
         <li class="item" role="presentation">