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/pricing/PricingFormClient.tsx

@@ -29,6 +29,7 @@ import {
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 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 { Textarea } from '@/components/ui/textarea';
 import { CurrencyInput } from '@/components/ui/currency-input';
@@ -426,11 +427,10 @@ export function PricingFormClient({
             <Label>
               적용일 <span className="text-red-500">*</span>
             </Label>
-            <Input
-              type="date"
+            <DatePicker
               value={effectiveDate}
-              onChange={(e) => {
-                setEffectiveDate(e.target.value);
+              onChange={(date) => {
+                setEffectiveDate(date);
                 setErrors((prev) => { const n = {...prev}; delete n.effectiveDate; return n; });
               }}
               className={errors.effectiveDate ? 'border-red-500' : ''}
@@ -457,10 +457,9 @@ export function PricingFormClient({
             </div>
             <div>
               <Label>입고일</Label>
-              <Input
-                type="date"
+              <DatePicker
                 value={receiveDate}
-                onChange={(e) => setReceiveDate(e.target.value)}
+                onChange={(date) => setReceiveDate(date)}
               />
             </div>
             <div>