Fix ordered list bullets and implement footnotes

- CSS: global reset `ul, ol { list-style: none }` was killing all bullets
  and numbers. Add list-style: disc/decimal back on .lt-markdown ul/ol.
  Remove duplicate ol rules.
- Footnotes: implement [^label] / [^label]: syntax. Uses placeholder
  approach (like code blocks) so <sup> tags aren't HTML-escaped. Renders
  inline superscript refs + numbered footnote block at bottom with
  back-links.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/js/markdown.js

@@ -6,6 +6,23 @@
 function parseMarkdown(markdown) {
     if (!markdown) return '';
 
+    // Footnotes — collect definitions and mark references with placeholders
+    // (must happen before HTML escaping so <sup> tags don't get escaped)
+    const footnotes = {};
+    const footnoteOrder = [];
+    const fnRefs = [];
+    markdown = markdown.replace(/^\[\^([^\]]+)\]:\s+(.+)$/gm, function(_, label, text) {
+        footnotes[label] = text;
+        return '';
+    });
+    markdown = markdown.replace(/\[\^([^\]]+)\]/g, function(_, label) {
+        if (!footnotes[label]) return '[^' + label + ']';
+        if (!footnoteOrder.includes(label)) footnoteOrder.push(label);
+        const n = footnoteOrder.indexOf(label) + 1;
+        fnRefs.push({ label, n });
+        return '%%FNREF' + (fnRefs.length - 1) + '%%';
+    });
+
     let html = markdown;
 
     // Escape HTML first to prevent XSS
@@ -122,11 +139,28 @@ function parseMarkdown(markdown) {
         html = html.replace('%%INLINECODE' + i + '%%', code);
     });
 
+    // Restore footnote reference placeholders
+    fnRefs.forEach(function(ref, i) {
+        html = html.replace('%%FNREF' + i + '%%',
+            '<sup class="fn-ref"><a href="#fn-' + ref.label + '" id="fnref-' + ref.label + '">[' + ref.n + ']</a></sup>');
+    });
+
     // Wrap in paragraph if not already wrapped
     if (!html.startsWith('<')) {
         html = '<p>' + html + '</p>';
     }
 
+    // Append footnote definitions block
+    if (footnoteOrder.length) {
+        html += '<hr class="fn-hr"><ol class="fn-list">';
+        footnoteOrder.forEach(function(label, i) {
+            html += '<li id="fn-' + label + '" class="fn-item">' +
+                parseMarkdown(footnotes[label]).replace(/<\/?p>/g, '') +
+                ' <a href="#fnref-' + label + '" class="fn-back">&#x21A9;</a></li>';
+        });
+        html += '</ol>';
+    }
+
     return html;
 }