chore: fix trailing slash problem

404.qmd

@@ -0,0 +1,24 @@
+---
+title: "Page Not Found"
+page-layout: full
+---
+
+<script>
+// Redirect trailing slash URLs to .html for GitHub Pages compatibility
+(function() {
+  var path = window.location.pathname;
+
+  // If URL ends with trailing slash and it's not the homepage
+  if (path.endsWith('/') && path !== '/') {
+    // Remove trailing slash and add .html
+    var newPath = path.slice(0, -1) + '.html';
+    window.location.replace(newPath);
+  }
+})();
+</script>
+
+## Page Not Found
+
+The page you're looking for doesn't exist. You'll be redirected shortly if this was caused by a trailing slash in the URL.
+
+[Return to homepage](/)