feat(cashier): integrate expected balance, settlement verification, and reconciliation checks

src/app/cashier/reconciliation/reconciliation.component.ts

@@ -73,6 +73,7 @@ export class ReconciliationComponent implements OnInit {
   cashierName = '';
   reconDate = '';
   note = '';
+  varianceReason = '';
   rows: DenomRow[] = [];
   loadingExpected = false;
   saving = false;
@@ -162,7 +163,11 @@ export class ReconciliationComponent implements OnInit {
     return v === 0 ? 'OK' : v > 0 ? 'EXCESS' : 'SHORT';
   }
   get valid(): boolean {
-    return !!this.selectedCashierId && this.rows.length > 0;
+    return (
+      !!this.selectedCashierId &&
+      this.rows.length > 0 &&
+      (this.totalVariance === 0 || this.varianceReason.trim().length > 0)
+    );
   }
 
   submit(): void {
@@ -173,7 +178,13 @@ export class ReconciliationComponent implements OnInit {
       tellerId: this.selectedTellerId,
       cashierName: this.cashierName,
       reconDate: this.reconDate,
-      note: this.note || null,
+      note:
+        [
+          this.note,
+          this.totalVariance !== 0 ? `Variance reason: ${this.varianceReason}` : null
+        ]
+          .filter(Boolean)
+          .join(' | ') || null,
       denominations: this.rows.map((r) => ({
         denominationId: r.denominationId,
         denominationValue: r.denominationValue,
@@ -190,6 +201,7 @@ export class ReconciliationComponent implements OnInit {
         });
         this.rows = [];
         this.note = '';
+        this.varianceReason = '';
         this.saving = false;
         this.loadHistory();
       },