Fix low stock, inventory movements, product sales, POS reports + payment search filter

1. Low stock: use min_stock_level (not reorder_point), eager-load inventoryLevels
2. Inventory movements: reference is a morphTo — show class_basename#id instead of raw object
3. Product sales: pos_transaction_items has item_type/item_id (not product_id)
4. POS transactions: relationship is processedBy (not user), field is receipt_number
5. Collect payment wizard: only search participants with outstanding invoices
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Domain/Shared/Services/ReportService.php

@@ -490,21 +490,21 @@ public function trainerWorkload(string $from, string $to, ?int $branchId = null)
 
     public function lowStockReport(?int $branchId = null): Collection
     {
-        return Product::with(['category'])
+        return Product::with(['category', 'inventoryLevels'])
             ->where('track_inventory', true)
             ->where('is_active', true)
             ->get()
             ->map(function ($product) {
-                $level = $product->inventoryLevels()->first();
+                $level = $product->inventoryLevels->first();
                 $onHand = $level?->quantity_on_hand ?? 0;
-                $reorder = $product->reorder_point ?? 0;
+                $minStock = $product->min_stock_level ?? 0;
                 return [
                     'product' => $product->name_ar ?? $product->name ?? '',
                     'sku' => $product->sku ?? '',
                     'category' => $product->category?->name_ar ?? '',
                     'on_hand' => $onHand,
-                    'reorder_point' => $reorder,
-                    'status' => $onHand <= 0 ? 'نفد' : ($onHand <= $reorder ? 'منخفض' : 'متوفر'),
+                    'reorder_point' => $minStock,
+                    'status' => $onHand <= 0 ? 'نفد' : ($onHand <= $minStock ? 'منخفض' : 'متوفر'),
                 ];
             })
             ->filter(fn ($p) => $p['on_hand'] <= $p['reorder_point'])
@@ -529,7 +529,7 @@ public function inventoryMovementReport(string $from, string $to, ?int $branchId
                 'quantity' => $m->quantity,
                 'before' => $m->quantity_before ?? 0,
                 'after' => $m->quantity_after ?? 0,
-                'reference' => $m->reference ?? '',
+                'reference' => $m->reference_type ? class_basename($m->reference_type) . '#' . $m->reference_id : '—',
             ]);
     }
 
@@ -537,10 +537,10 @@ public function productSalesReport(string $from, string $to, ?int $branchId = nu
     {
         return DB::table('pos_transaction_items')
             ->join('pos_transactions', 'pos_transactions.id', '=', 'pos_transaction_items.pos_transaction_id')
-            ->join('products', 'products.id', '=', 'pos_transaction_items.product_id')
+            ->join('products', 'products.id', '=', 'pos_transaction_items.item_id')
+            ->where('pos_transaction_items.item_type', 'product')
             ->whereBetween('pos_transactions.processed_at', [$from, $to . ' 23:59:59'])
             ->when($branchId, fn ($q) => $q->where('pos_transactions.branch_id', $branchId))
-            ->whereNotNull('pos_transaction_items.product_id')
             ->select(
                 'products.name_ar as product',
                 'products.sku',
@@ -556,7 +556,7 @@ public function productSalesReport(string $from, string $to, ?int $branchId = nu
 
     public function posTransactionReport(string $from, string $to, ?int $branchId = null): Collection
     {
-        return POSTransaction::with(['user', 'branch'])
+        return POSTransaction::with(['processedBy', 'branch'])
             ->whereBetween('processed_at', [$from, $to . ' 23:59:59'])
             ->when($branchId, fn ($q) => $q->where('branch_id', $branchId))
             ->orderByDesc('processed_at')
@@ -564,12 +564,12 @@ public function posTransactionReport(string $from, string $to, ?int $branchId =
             ->get()
             ->map(fn ($t) => [
                 'date' => $t->processed_at?->format('Y-m-d H:i'),
-                'number' => $t->transaction_number ?? '',
+                'number' => $t->receipt_number ?? '',
                 'total' => $t->total_amount,
                 'discount' => $t->discount_amount ?? 0,
-                'items_count' => $t->items_count ?? 0,
-                'payment_method' => $t->payment_method?->value ?? $t->payment_method ?? '',
-                'cashier' => $t->user?->name ?? '',
+                'items_count' => $t->items()->count(),
+                'payment_method' => $t->payment_method ?? '',
+                'cashier' => $t->processedBy?->name ?? '',
                 'branch' => $t->branch?->name_ar ?? '',
             ]);
     }

app/Livewire/Receptionist/CollectPaymentWizard.php

@@ -195,6 +195,7 @@ public function render()
             $searchResults = Participant::query()
                 ->with('person')
                 ->where('branch_id', $this->branchId)
+                ->whereHas('invoices', fn ($iq) => $iq->whereIn('status', ['sent', 'partially_paid', 'overdue']))
                 ->where(function ($q) {
                     $search = $this->search;
                     $q->where('participant_number', 'ilike', "%{$search}%")