fix school year and related issues

app/Views/parent/register_student.php

@@ -110,7 +110,7 @@ $disableEmergencyBtn = count($emergencies) >= $maxEmergency;
                             ?>
                         </td>
                         <td class="text-center">
-                            <?php if ($isEditable && $kid['enrollment'] == 0): ?>
+                            <?php if ($isEditable && !empty($kid['can_delete'])): ?>
                                 <form action="<?= base_url('/parent/delete_student/' . $kid['id']) ?>"
                                     method="post"
                                     style="display:inline">
@@ -126,7 +126,7 @@ $disableEmergencyBtn = count($emergencies) >= $maxEmergency;
                                     </button>
                                 </form>
                             <?php else: ?>
-                                <button type="button" class="btn btn-sm btn-outline-secondary" disabled title="<?= $isEditable ? 'Student is already enrolled' : 'This school year is read-only' ?>">
+                                <button type="button" class="btn btn-sm btn-outline-secondary" disabled title="<?= $isEditable ? 'Student has enrollment history and cannot be deleted' : 'This school year is read-only' ?>">
                                     <i class="fas fa-ban"></i> Delete
                                 </button>
                             <?php endif; ?>