Fix session completion, trainer workload, and wallet balance reports

1. Session completion: column is 'session_date' not 'date'
2. Trainer workload: TrainingGroup has no assignments() — use TrainingSession.trainer_id via employee→user link, count groups via head_trainer_id
3. Wallet balances: Wallet uses polymorphic owner() not participant() — use owner with owner_type filter
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Domain/Shared/Services/ReportService.php

@@ -454,24 +454,34 @@ public function retentionReport(string $from, string $to, ?int $branchId = null)
 
     public function trainerWorkload(string $from, string $to, ?int $branchId = null): Collection
     {
-        return Trainer::with(['person'])
+        return Trainer::with(['person', 'employee'])
             ->where('status', 'active')
             ->get()
             ->map(function ($trainer) use ($from, $to, $branchId) {
-                $sessions = TrainingSession::whereHas('group.assignments', fn ($q) => $q->where('trainer_id', $trainer->id))
-                    ->whereBetween('date', [$from, $to])
+                $userId = $trainer->employee?->user_id;
+                if (!$userId) {
+                    return null;
+                }
+
+                $sessions = TrainingSession::where('trainer_id', $userId)
+                    ->whereBetween('session_date', [$from, $to])
                     ->when($branchId, fn ($q) => $q->whereHas('group', fn ($g) => $g->where('branch_id', $branchId)));
 
+                $groupsCount = TrainingGroup::where('head_trainer_id', $userId)
+                    ->where('status', 'active')
+                    ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))
+                    ->count();
+
                 return [
                     'name' => $trainer->person?->name_ar ?? '',
                     'phone' => $trainer->person?->phone ?? '',
                     'total_sessions' => (clone $sessions)->count(),
                     'completed' => (clone $sessions)->where('status', 'completed')->count(),
                     'cancelled' => (clone $sessions)->where('status', 'cancelled')->count(),
-                    'groups_count' => $trainer->assignments()->where('status', 'active')->distinct('training_group_id')->count('training_group_id'),
+                    'groups_count' => $groupsCount,
                 ];
             })
-            ->filter(fn ($t) => $t['total_sessions'] > 0)
+            ->filter(fn ($t) => $t && $t['total_sessions'] > 0)
             ->sortByDesc('total_sessions')
             ->values();
     }
@@ -583,8 +593,7 @@ public function posDailySummary(string $from, string $to, ?int $branchId = null)
 
     public function sessionCompletionReport(string $from, string $to, ?int $branchId = null): Collection
     {
-        return TrainingSession::with(['group.program', 'group.branch'])
-            ->whereBetween('date', [$from, $to])
+        return TrainingSession::whereBetween('session_date', [$from, $to])
             ->when($branchId, fn ($q) => $q->whereHas('group', fn ($g) => $g->where('branch_id', $branchId)))
             ->select('status', DB::raw('COUNT(*) as count'))
             ->groupBy('status')
@@ -626,15 +635,16 @@ public function branchComparison(string $from, string $to): Collection
 
     public function walletBalances(?int $branchId = null): Collection
     {
-        return Wallet::with(['participant.person'])
+        return Wallet::with(['owner.person'])
+            ->where('owner_type', 'App\\Domain\\Participant\\Models\\Participant')
             ->where('status', 'active')
             ->where('balance', '>', 0)
-            ->when($branchId, fn ($q) => $q->whereHas('participant', fn ($p) => $p->where('branch_id', $branchId)))
+            ->when($branchId, fn ($q) => $q->whereHasMorph('owner', [Participant::class], fn ($p) => $p->where('branch_id', $branchId)))
             ->orderByDesc('balance')
             ->get()
             ->map(fn ($w) => [
-                'participant' => $w->participant?->person?->name_ar ?? '',
-                'phone' => $w->participant?->person?->phone ?? '',
+                'participant' => $w->owner?->person?->name_ar ?? '',
+                'phone' => $w->owner?->person?->phone ?? '',
                 'balance' => $w->balance,
                 'frozen' => $w->frozen_amount ?? 0,
                 'available' => $w->balance - ($w->frozen_amount ?? 0),