Fix getColumnsFromAbraFlexi to handle string conditions

Convert string conditions to array with 'filter' key to prevent

TypeError when accessing array offset on string type.

This fixes issues when conditions are passed as string instead of array.

Author: Vitexus

src/AbraFlexi/RO.php

@@ -1881,6 +1881,11 @@ public function getColumnsFromAbraFlexi(
                 break;
         }
 
+        // Ensure conditions is an array
+        if (\is_string($conditions)) {
+            $conditions = ['filter' => $conditions];
+        }
+
         $conditions['detail'] = $detail;
         $flexiData = $this->getFlexiData('', $conditions);