fix:모달 수당 합계를 예상 수당 값으로 통일

- $stats['total_commission'] → $totalCommissionAmount로 변경
- 카드와 모달의 수당 합계 일치

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

resources/views/sales/dashboard/partials/stats.blade.php

@@ -234,8 +234,8 @@ class="p-1.5 text-gray-400 hover:text-gray-600 hover:bg-gray-100 rounded-lg tran
 
                 {{-- 수당 합계 --}}
                 <div class="bg-gray-100 rounded-lg p-3 flex items-center justify-between">
-                    <span class="text-sm font-medium text-gray-600">수당 합계</span>
-                    <span class="text-xl font-bold text-gray-900">{{ number_format($stats['total_commission'] ?? 0) }}원</span>
+                    <span class="text-sm font-medium text-gray-600">예상 수당 합계</span>
+                    <span class="text-xl font-bold text-gray-900">{{ number_format($totalCommissionAmount) }}원</span>
                 </div>
             </div>
         </div>