fix: neutral TOC links + poll-based map/chart init (timing fix)

TOC links now gray (#4b5563) instead of accent color.
Map and charts use polling (100ms retry) to wait for libs
instead of window.load which fires too early.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/shortcodes/law-charts.html

@@ -36,7 +36,8 @@
 
 <script src="{{ "js/chart.umd.min.js" | relURL }}"></script>
 <script>
-window.addEventListener('load', function() {
+(function initCharts() {
+  if (typeof Chart === 'undefined') { setTimeout(initCharts, 100); return; }
   var LANG = "{{ $lang }}";
   var countries = {{ $countries | jsonify }};
 
@@ -120,5 +121,5 @@ window.addEventListener('load', function() {
       plugins: { legend: { position: 'bottom', labels: { padding: 16, usePointStyle: true } } }
     }
   });
-});
+})();
 </script>