Add trailing slash redirect for list routes

app/router.php

@@ -82,6 +82,12 @@ switch ($parsedPath['type']) {
     case 'list':
         $dir = $parsedPath['path'];
         
+        // Redirect to add trailing slash if needed
+        if (!$ctx->hasTrailingSlash) {
+            header('Location: ' . rtrim($_SERVER['REQUEST_URI'], '/') . '/', true, 301);
+            exit;
+        }
+        
         // Check for page content files in this directory
         $pageContent = null;
         $contentFiles = findAllContentFiles($dir);