Fix PDF: move page grid code inside IIFE (ReferenceError fix)

public/pdf.html

@@ -1657,8 +1657,6 @@
     // ─── Security sub-op default ──────────────────────────────────────────────
     state.securitySub = 'protect';
 
-})();
-
     // ─── Page Grid Thumbnails ─────────────────────────────────────────────────
     function renderPageGrid(gridId, hintId, fileId, pages, mode) {
         const grid = document.getElementById(gridId);
@@ -1704,6 +1702,9 @@
             renderPageGrid('reorderPageGrid', 'reorderHint', sel.id, sel.pages, 'reorder');
         }
     };
+
+})();
+
 </script>
 
 </body>