fix(admin): convert toman to rial when recording session payment/discount

PaymentStep sent the toman amount straight through as amount_rials (and the
fixed discount value as discount_value), so a 500,000 toman payment was stored
as 5,000,000... no — as 500,000 rial (10x too small). Apply tomanToRial before
sending the payment amount and the fixed-discount value; percent discount and
rule-based discount are unaffected. Verified stored value is now correct rial.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/components/session/PaymentStep.tsx

@@ -4,7 +4,7 @@ import { ChevronDownIcon } from '@heroicons/react/24/outline';
 import { toast } from 'sonner';
 import { api } from '../../lib/api';
 import type { ApiResponse } from '../../lib/api';
-import { formatRial } from '../../lib/utils';
+import { formatRial, formatDateTime, tomanToRial } from '../../lib/utils';
 import type { DiscountSuggestion } from '../../types';
 import type { SessionCardData } from '../SessionServiceCard';
 import SearchableSelect from '../ui/SearchableSelect';
@@ -80,7 +80,9 @@ export default function PaymentStep({ recordUuid, session, walletBalance, onCont
 
   const applyDiscount = () => {
     if (!discountType || discountValue <= 0) return;
-    discountMut.mutate({ discount_type: discountType, discount_value: discountValue });
+    // percent درصد است (بدون تبدیل)؛ fixed مبلغ تومان است → ریال.
+    const value = discountType === 'fixed' ? tomanToRial(discountValue) : discountValue;
+    discountMut.mutate({ discount_type: discountType, discount_value: value });
   };
   const applyRule = (ruleUuid: string) => {
     discountMut.mutate({ discount_rule_uuid: ruleUuid });
@@ -91,7 +93,7 @@ export default function PaymentStep({ recordUuid, session, walletBalance, onCont
   };
   const submitPayment = (method: string) => {
     if (amount <= 0) return;
-    payMut.mutate({ method, amount_rials: amount, paid_at: isoToUnix(paymentDate) });
+    payMut.mutate({ method, amount_rials: tomanToRial(amount), paid_at: isoToUnix(paymentDate) });
   };
 
   const finalPrice = session.final_price_rials ?? 0;