Clear existing ordering when groupBy is active

MySQL's ONLY_FULL_GROUP_BY mode rejects ORDER BY clauses that reference
non-aggregated columns not in the GROUP BY. Use reorder() to clear
inherited ordering and default to ordering by the group column.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: SimonBarrettACT

src/ReportBuilder.php

@@ -38,8 +38,10 @@ public function rowsQuery()
             ? $this->resolveColumnWithJoins($query, $this->aggregateColumn)
             : "{$baseTable}.{$this->aggregateColumn}";
 
-        $query->selectRaw("{$groupByColumn} as group_value, {$this->aggregateFunction}({$aggregateColumn}) as aggregate")
-            ->groupBy($groupByColumn);
+        $query->reorder()
+            ->selectRaw("{$groupByColumn} as group_value, {$this->aggregateFunction}({$aggregateColumn}) as aggregate")
+            ->groupBy($groupByColumn)
+            ->orderBy($groupByColumn);
 
         return $query;
     }