fix: remove duplicate safeHighlight declaration in utils.js

- Caused 'Identifier already declared' error — app won't load
- Original safeHighlight at line 250 (initEditor scope), duplicate removed

frontend/js/utils.js

@@ -650,10 +650,6 @@ function initEditor() {
   );
 }
 
-function safeHighlight(block) {
-  try { hljs.highlightElement(block); } catch (e) { /* skip */ }
-}
-
 /** Copy text to clipboard — works on both HTTP and HTTPS */
 function copyToClipboard(text) {
   // Try modern API first (HTTPS-only)