feat(WEB): DatePicker 공통화 및 공정관리/작업자화면 대폭 개선

DatePicker 공통화:
- date-picker.tsx 공통 컴포넌트 신규 추가
- 전체 폼 컴포넌트 DatePicker 통일 적용 (50+ 파일)
- DateRangeSelector 개선

공정관리:
- RuleModal 대폭 리팩토링 (-592줄 → 간소화)
- ProcessForm, StepForm 개선
- ProcessDetail 수정, actions 확장

작업자화면:
- WorkerScreen 기능 대폭 확장 (+543줄)
- WorkItemCard 개선
- types 확장

회계/인사/영업/품질:
- BadDebtDetail, BillDetail, DepositDetail, SalesDetail 등 DatePicker 적용
- EmployeeForm, VacationDialog 등 DatePicker 적용
- OrderRegistration, QuoteRegistration DatePicker 적용
- InspectionCreate, InspectionDetail DatePicker 적용

공사관리/CEO대시보드:
- BiddingDetail, ContractDetail, HandoverReport 등 DatePicker 적용
- ScheduleDetailModal, TodayIssueSection 개선

기타:
- WorkOrderCreate/Edit/Detail/List 개선
- ShipmentCreate/Edit, ReceivingDetail 개선
- calendar, calendarEvents 수정
- datepicker 마이그레이션 체크리스트 추가

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

src/components/process-management/ProcessListClient.tsx

@@ -236,7 +236,6 @@ export default function ProcessListClient({ initialData = [], initialStats }: Pr
         { key: 'processCode', label: '공정번호', className: 'w-[120px]' },
         { key: 'processName', label: '공정명', className: 'min-w-[200px]' },
         { key: 'department', label: '담당부서', className: 'w-[120px]' },
-        { key: 'steps', label: '단계', className: 'w-[80px] text-center' },
         { key: 'items', label: '품목', className: 'w-[80px] text-center' },
         { key: 'status', label: '상태', className: 'w-[80px] text-center' },
       ],
@@ -329,7 +328,6 @@ export default function ProcessListClient({ initialData = [], initialStats }: Pr
             <TableCell className="font-medium">{process.processCode}</TableCell>
             <TableCell>{process.processName}</TableCell>
             <TableCell>{process.department}</TableCell>
-            <TableCell className="text-center">{process.steps?.length ?? 0}</TableCell>
             <TableCell className="text-center">{itemCount > 0 ? itemCount : '-'}</TableCell>
             <TableCell className="text-center" onClick={(e) => e.stopPropagation()}>
               <Badge
@@ -383,7 +381,6 @@ export default function ProcessListClient({ initialData = [], initialStats }: Pr
             infoGrid={
               <div className="grid grid-cols-2 gap-x-4 gap-y-3">
                 <InfoField label="담당부서" value={process.department} />
-                <InfoField label="단계" value={`${process.steps?.length ?? 0}개`} />
                 <InfoField label="품목" value={itemCount > 0 ? `${itemCount}개` : '-'} />
               </div>
             }