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/accounting/BadDebtCollection/BadDebtDetail.tsx

@@ -12,6 +12,7 @@ import { format } from 'date-fns';
 import { Plus, X, FileText, Receipt, CreditCard, Upload, Download, Trash2 } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
+import { DatePicker } from '@/components/ui/date-picker';
 import { Label } from '@/components/ui/label';
 import { PhoneInput } from '@/components/ui/phone-input';
 import { BusinessNumberInput } from '@/components/ui/business-number-input';
@@ -836,23 +837,19 @@ export function BadDebtDetail({ mode, recordId, initialData }: BadDebtDetailProp
               {/* 악성채권 발생일 */}
               <div className="space-y-2">
                 <Label className="text-sm font-medium text-gray-700">악성채권 발생일</Label>
-                <Input
-                  type="date"
+                <DatePicker
                   value={formData.occurrenceDate}
-                  onChange={(e) => handleChange('occurrenceDate', e.target.value)}
+                  onChange={(date) => handleChange('occurrenceDate', date)}
                   disabled={isViewMode}
-                  className="bg-white"
                 />
               </div>
               {/* 악성채권 종료일 */}
               <div className="space-y-2">
                 <Label className="text-sm font-medium text-gray-700">악성채권 종료일</Label>
-                <Input
-                  type="date"
+                <DatePicker
                   value={formData.endDate || ''}
-                  onChange={(e) => handleChange('endDate', e.target.value || null)}
+                  onChange={(date) => handleChange('endDate', date || null)}
                   disabled={isViewMode}
-                  className="bg-white"
                   placeholder="-"
                 />
               </div>