Fix updater settings panel error when updater.js is blocked

Add defensive typeof checks before referencing the Updater global in
loadUpdateStatus() and checkForUpdatesManual() so the settings panel
shows a helpful message instead of crashing. Also swap script load
order so updater.js loads before settings-manager.js.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/index.html

@@ -13925,10 +13925,10 @@
     <!-- Toast Container -->
     <div id="toastContainer"></div>
 
-    <!-- Settings Manager -->
-    <script src="{{ url_for('static', filename='js/core/settings-manager.js') }}"></script>
     <!-- Updater -->
     <script src="{{ url_for('static', filename='js/core/updater.js') }}"></script>
+    <!-- Settings Manager -->
+    <script src="{{ url_for('static', filename='js/core/settings-manager.js') }}"></script>
 </body>
 
 </html>