거래 관련 페이지 다국어화 완료 (현금영수증, 에스크로, 빌링)

- 현금영수증 페이지 다국어화 (목록, 상세, 수기발행)
  * 승인/취소 금액 통화 표기 개선 (₩ prefix for EN)
  * 검색옵션, 다운로드, 용도변경 등 모든 텍스트 다국어화
- 에스크로 페이지 다국어화 (목록, 상세)
  * 헤더 타이틀 및 UI 텍스트 다국어화
- 빌링 페이지 다국어화 (목록, 상세, 청구)
  * 통화 표기 언어별 처리 (한국어: 원 suffix / 영어: ₩ prefix)
- 번역 키 추가: cashReceipt, escrow, billing, common 네임스페이스
- 모든 거래 페이지 일관된 다국어 지원 완료

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/pages/transaction/billing/charge-page.tsx

@@ -1,4 +1,5 @@
 import { ChangeEvent, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { PATHS } from '@/shared/constants/paths';
 import { IMAGE_ROOT } from '@/shared/constants/common';
 import { useNavigate } from '@/shared/lib/hooks/use-navigate';
@@ -18,6 +19,7 @@ import { notiBar, snackBar } from '@/shared/lib';
 
 export const BillingChargePage = () => {
   const { navigate } = useNavigate();
+  const { t } = useTranslation();
 
   const [billKey, setBillKey] = useState<string>('');
   const [productName, setProductName] = useState<string>('');
@@ -30,7 +32,7 @@ export const BillingChargePage = () => {
   const [calendarOpen, setCalendarOpen] = useState<boolean>(false);
 
 
-  useSetHeaderTitle('빌링 결제 신청');
+  useSetHeaderTitle(t('billing.charge'));
   useSetHeaderType(HeaderType.RightClose);
   useSetOnBack(() => {
     navigate(PATHS.transaction.billing.list);

src/pages/transaction/billing/detail-page.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { useLocation } from 'react-router';
 import { PATHS } from '@/shared/constants/paths';
 import { useNavigate } from '@/shared/lib/hooks/use-navigate';
@@ -24,6 +25,7 @@ import { AmountInfoSection } from '@/entities/transaction/ui/section/amount-info
 
 export const BillingDetailPage = () => {
   const { navigate } = useNavigate();
+  const { t, i18n } = useTranslation();
   const location = useLocation();
   const tid = location?.state.tid;
   const serviceCode = location?.state.serviceCode;
@@ -32,7 +34,7 @@ export const BillingDetailPage = () => {
   const [billingInfo, setBillingInfo] = useState<BillingInfo>();
   const [amountInfo, setAmountInfo] = useState<AmountInfo>();
 
-  useSetHeaderTitle('빌링 상세');
+  useSetHeaderTitle(t('billing.detailTitle'));
   useSetHeaderType(HeaderType.RightClose);
   useSetOnBack(() => {
     navigate(PATHS.transaction.billing.list);
@@ -67,12 +69,13 @@ export const BillingDetailPage = () => {
                 <div className="txn-num-group">
                   <div className="txn-amount">
                     <div className="value">
+                      { i18n.language === 'en' && <span className="unit">{ t('home.currencySymbol') }</span> }
                       <NumericFormat
-                        value={ amountInfo?.transactionAmount } 
+                        value={ amountInfo?.transactionAmount }
                         thousandSeparator
                         displayType="text"
                       ></NumericFormat>
-                      <span className="unit">원</span>
+                      { i18n.language !== 'en' && <span className="unit">{ t('home.currencyWon') }</span> }
                     </div>
                   </div>
                   <div className="txn-mid">

src/pages/transaction/billing/list-page.tsx

@@ -1,5 +1,6 @@
 import moment from 'moment';
 import { useEffect, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { useStore } from '@/shared/model/store';
 import { IMAGE_ROOT } from '@/shared/constants/common';
 import { PATHS } from '@/shared/constants/paths';
@@ -33,6 +34,7 @@ import useIntersectionObserver from '@/widgets/intersection-observer';
 
 export const BillingListPage = () => {
 	const { navigate } = useNavigate();
+	const { t } = useTranslation();
 	const userMid = useStore.getState().UserStore.mid;
 	
 	const [onActionIntersect, setOnActionIntersect] = useState<boolean>(false);
@@ -54,7 +56,7 @@ export const BillingListPage = () => {
 
 	const [downloadBottomSheetOn, setDownloadBottomSheetOn] = useState<boolean>(false);
 
-	useSetHeaderTitle('빌링');
+	useSetHeaderTitle(t('billing.title'));
 	useSetHeaderType(HeaderType.LeftArrow);
 	useSetOnBack(() => {
 		navigate(PATHS.home);
@@ -176,19 +178,19 @@ export const BillingListPage = () => {
 										readOnly={ true } 
 									/>
 									<button className="filter-btn">
-										<img 
-											src={ IMAGE_ROOT + '/ico_setting.svg' } 
-											alt="검색옵션"
+										<img
+											src={ IMAGE_ROOT + '/ico_setting.svg' }
+											alt={ t('transaction.searchOptions') }
 											onClick={ () => onClickToOpenFilter() }
 										/>
 									</button>
 								</div>
 								<button className="download-btn">
-									<img 
-										src={ IMAGE_ROOT + '/ico_download.svg' } 
-										alt="다운로드"
+									<img
+										src={ IMAGE_ROOT + '/ico_download.svg' }
+										alt={ t('transaction.download') }
 										onClick={ () => onClickToOpenDownloadBottomSheet() }
-                  />
+									/>
 								</button>
 							</div>
 						</div>