fix(sa): fix group auto-creation and old() array conversion errors

- Remove non-existent facility_unit_id from sa_groups insert in
  enrollByCoach, add required code column with auto-generated value
- Guard schedule copy when no source group exists
- Fix old() helper usage for array fields (additional_coaches) by
  reading directly from session _old_input instead of old() which
  only returns strings
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/SportsActivity/Services/EnrollmentService.php

@@ -455,37 +455,33 @@ final class EnrollmentService
         }
 
         // No available group — auto-create one
+        $coach = $db->selectOne("SELECT full_name_ar FROM sa_coaches WHERE id = ?", [$coachId]);
+        $coachName = $coach['full_name_ar'] ?? 'مدرب';
+        $newName = $program['name_ar'] . ' - ' . $coachName;
+        $newCode = 'GRP-' . strtoupper(substr(uniqid(), -6));
+
         $sourceGroup = $db->selectOne(
             "SELECT * FROM sa_groups WHERE program_id = ? AND is_archived = 0 ORDER BY id DESC LIMIT 1",
             [$programId]
         );
 
-        if (!$sourceGroup) {
-            return ['success' => false, 'error' => 'لا توجد مجموعات مرجعية لإنشاء مجموعة جديدة'];
-        }
-
-        $coach = $db->selectOne("SELECT full_name_ar FROM sa_coaches WHERE id = ?", [$coachId]);
-        $coachName = $coach['full_name_ar'] ?? 'مدرب';
-        $newName = $program['name_ar'] . ' - ' . $coachName;
-
         $employeeId = (int) (App::getInstance()->session()->get('employee_id') ?? 0);
 
         $db->beginTransaction();
         try {
             $newGroupId = $db->insert('sa_groups', [
+                'code'                  => $newCode,
                 'name_ar'               => $newName,
                 'program_id'            => $programId,
-                'facility_unit_id'      => $sourceGroup['facility_unit_id'],
                 'coach_id'              => $coachId,
                 'monthly_fee_member'    => 0,
                 'monthly_fee_nonmember' => 0,
-                'min_age'               => $sourceGroup['min_age'],
-                'max_age'               => $sourceGroup['max_age'],
+                'min_age'               => $sourceGroup['min_age'] ?? null,
+                'max_age'               => $sourceGroup['max_age'] ?? null,
                 'max_capacity'          => (int) ($program['max_capacity'] ?? 20),
                 'current_count'         => 0,
                 'is_full'               => 0,
                 'status'                => 'active',
-                'branch_id'             => $sourceGroup['branch_id'] ?? null,
                 'created_by'            => $employeeId,
                 'created_at'            => date('Y-m-d H:i:s'),
                 'updated_at'            => date('Y-m-d H:i:s'),
@@ -499,7 +495,8 @@ final class EnrollmentService
                 'created_at' => date('Y-m-d H:i:s'),
             ]);
 
-            // Copy schedule from source
+            // Copy schedule from source if available
+            if ($sourceGroup) {
                 $schedules = $db->select(
                     "SELECT * FROM sa_group_schedule WHERE group_id = ? AND is_active = 1",
                     [(int) $sourceGroup['id']]
@@ -516,6 +513,7 @@ final class EnrollmentService
                         'updated_at'       => date('Y-m-d H:i:s'),
                     ]);
                 }
+            }
 
             $db->commit();
         } catch (\Throwable $e) {

app/Modules/SportsActivity/Views/groups/create.php

@@ -66,7 +66,8 @@
                     <label class="form-label">مدربين إضافيين</label>
                     <div id="additional-coaches" style="display:flex;flex-wrap:wrap;gap:8px;margin-top:6px;">
                         <?php
-                            $oldAdditional = old('additional_coaches', []);
+                            $oldInput = \App\Core\App::getInstance()->session()->get('_old_input', []);
+                            $oldAdditional = $oldInput['additional_coaches'] ?? [];
                             if (!is_array($oldAdditional)) $oldAdditional = [];
                         ?>
                         <?php foreach ($coaches as $c): ?>

app/Modules/SportsActivity/Views/groups/edit.php

@@ -66,7 +66,8 @@
                     <label class="form-label">مدربين إضافيين</label>
                     <div id="additional-coaches" style="display:flex;flex-wrap:wrap;gap:8px;margin-top:6px;">
                         <?php
-                            $oldAdditional = old('additional_coaches', $groupCoachIds ?? []);
+                            $oldInput = \App\Core\App::getInstance()->session()->get('_old_input', []);
+                            $oldAdditional = $oldInput['additional_coaches'] ?? ($groupCoachIds ?? []);
                             if (!is_array($oldAdditional)) $oldAdditional = [];
                         ?>
                         <?php foreach ($coaches as $c): ?>