Rename shadowed prefix variable in toImportedPublishSection

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jasonvarga

src/Fields/Tab.php

@@ -165,9 +165,9 @@ private function toImportedPublishSection(array $section, array $import): array
             $fields = $fields->mapWithKeys(function ($field) use ($prefix) {
                 $field = clone $field;
                 $handle = $prefix.$field->handle();
-                $prefix = $prefix.$field->prefix();
+                $fieldPrefix = $prefix.$field->prefix();
 
-                return [$handle => $field->setHandle($handle)->setPrefix($prefix)];
+                return [$handle => $field->setHandle($handle)->setPrefix($fieldPrefix)];
             });
         }