fix(date): UTC 기반 날짜를 로컬 타임존으로 변경

- 공통 날짜 유틸리티 함수 추가 (src/utils/date.ts)
  - getLocalDateString(): 로컬 타임존 YYYY-MM-DD 포맷
  - getTodayString(): 오늘 날짜 반환
  - getDateAfterDays(): N일 후 날짜 계산
  - formatDateForInput(): API 응답 → input 포맷 변환

- toISOString().split('T')[0] 패턴을 공통 함수로 교체
  - 견적: QuoteRegistration, QuoteRegistrationV2, types
  - 건설: contract, site-briefings, estimates, bidding types
  - 건설: IssueDetailForm, ConstructionDetailClient, ProjectEndDialog
  - 자재: InspectionCreate, ReceivingReceiptContent, StockStatus/mockData
  - 품질: InspectionManagement/mockData
  - 기타: PricingFormClient, ShipmentCreate, PurchaseOrderDocument
  - 기타: MainDashboard, attendance/actions, dev/generators

문제: toISOString()은 UTC 기준이라 한국(UTC+9)에서 오전 9시 이전에
      전날 날짜가 표시되는 버그 발생
해결: 로컬 타임존 기반 날짜 포맷 함수로 통일

src/components/material/ReceivingManagement/InspectionCreate.tsx

@@ -13,6 +13,7 @@
 import { useState, useCallback, useMemo, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
 import { Calendar } from 'lucide-react';
+import { getTodayString } from '@/utils/date';
 import { IntegratedDetailTemplate } from '@/components/templates/IntegratedDetailTemplate';
 import { materialInspectionCreateConfig } from './inspectionConfig';
 import { ContentSkeleton } from '@/components/ui/skeleton';
@@ -66,10 +67,7 @@ export function InspectionCreate({ id }: Props) {
   const [selectedTargetId, setSelectedTargetId] = useState<string>(id || '');
 
   // 검사 정보
-  const [inspectionDate, setInspectionDate] = useState(() => {
-    const today = new Date();
-    return today.toISOString().split('T')[0];
-  });
+  const [inspectionDate, setInspectionDate] = useState(() => getTodayString());
   const [inspector, setInspector] = useState('');
   const [lotNo, setLotNo] = useState(() => generateLotNo());
 

src/components/material/ReceivingManagement/ReceivingReceiptContent.tsx

@@ -9,6 +9,7 @@
 
 import type { ReceivingDetail } from './types';
 import { DocumentHeader } from '@/components/document-system';
+import { getTodayString } from '@/utils/date';
 
 interface ReceivingReceiptContentProps {
   data: ReceivingDetail;
@@ -38,7 +39,7 @@ export function ReceivingReceiptContent({ data: detail }: ReceivingReceiptConten
             <span className="text-muted-foreground">입고번호</span>
             <span className="font-medium">{detail.orderNo}</span>
             <span className="text-muted-foreground">입고일자</span>
-            <span>{detail.receivingDate || today.toISOString().split('T')[0]}</span>
+            <span>{detail.receivingDate || getTodayString()}</span>
             <span className="text-muted-foreground">발주번호</span>
             <span>{detail.orderNo}</span>
             <span className="text-muted-foreground">입고LOT</span>

src/components/material/StockStatus/mockData.ts

@@ -3,6 +3,7 @@
  */
 
 import type { StockItem, StockDetail, StockStats, FilterTab } from './types';
+import { getLocalDateString } from '@/utils/date';
 
 // 재고 상태 결정 함수
 function getStockStatus(stockQty: number, safetyStock: number): 'normal' | 'low' | 'out' {
@@ -418,7 +419,7 @@ export function generateStockDetail(item: StockItem): StockDetail {
     const daysAgo = seededInt(lotSeed, 5, 60);
     const date = new Date('2025-12-23'); // 고정 날짜 사용
     date.setDate(date.getDate() - daysAgo);
-    const dateStr = date.toISOString().split('T')[0];
+    const dateStr = getLocalDateString(date);
     const lotDate = dateStr.replace(/-/g, '').slice(2);
 
     return {