chore: add jQuery Migrate for deprecation detection during upgrade

Include jQuery Migrate 3.4.1 to identify and resolve deprecated jQuery
APIs used in the codebase. This temporary tool logs warnings in the
browser console for outdated patterns (e.g., $.browser, $.live), helping
us modernize the JavaScript safely.

This addition is part of a migration plan:
1. Add Migrate
2. Fix reported issues
3. Remove Migrate when clean

See: https://jquery.com/upgrade-guide/3.0/#jquery-migrate-plugin

Author: RafaelJohn9

layouts/partials/footer.html

@@ -11,8 +11,9 @@
   <img src="{{ relURL "images/icons/chevron-up@2x.png" }}" width="20" height="20" alt="scroll-to-top"/>
 </a>
 
-<script src="{{ relURL "js/jquery-1.7.1.min.js" }}"></script>
-<script src="{{ relURL "js/jquery-ui-1.8.18.custom.min.js" }}"></script>
+<script src="https://code.jquery.com/jquery-migrate-3.4.1.min.js"></script>
+<script src="{{ relURL "js/jquery-3.7.1.min.js" }}"></script>
+<script src="{{ relURL "js/jquery-ui-1.14.1.min.js" }}"></script>
 <script src="{{ relURL "js/jquery.defaultvalue.js" }}"></script>
 <script src="{{ relURL "js/session.min.js" }}"></script>
 {{ $js := resources.Get "js/application.js" | resources.ExecuteAsTemplate "js/application.js" . | resources.Minify | fingerprint }}