Fix undefined $from– variable: brace-interpolate variables before en-dash in double-quoted string

public/admin/index.php

@@ -365,7 +365,7 @@ document.addEventListener('DOMContentLoaded', () => {
         $from = $offset + 1;
         $to   = min($offset + $perPage, $totalCount);
         if ($totalPages > 1) {
-            echo "$from–$to sur $totalCount TFE";
+            echo "{$from}–{$to} sur {$totalCount} TFE";
         } else {
             echo "$totalCount TFE";
         }