enhanced client results and export functionality with coach and supervisor details, added date filters for results

api/results.php

@@ -73,9 +73,13 @@ if ($clientCode) {
 // Only clients that have a completed_questionnaire entry for this questionnaire
 $sql = "
     SELECT cl.clientCode, cl.coachID,
+           co.username AS coachUsername,
+           sv.username AS supervisorUsername,
            cq.status, cq.startedAt, cq.completedAt, cq.sumPoints, cq.assignedByCoach
     FROM client cl
     INNER JOIN completed_questionnaire cq ON cq.clientCode = cl.clientCode AND cq.questionnaireID = :qnid
+    LEFT JOIN coach co ON co.coachID = cl.coachID
+    LEFT JOIN supervisor sv ON sv.supervisorID = co.supervisorID
     WHERE $rbacClause
 ";
 $params = array_merge([':qnid' => $qnID], $rbacParams);