refactor: UniversalListPage externalIsLoading 지원 및 스켈레톤 개선

- UniversalListPage에 externalIsLoading prop 추가
- CardTransactionDetailClient DevFill 자동입력 기능 추가
- 여러 컴포넌트 로딩 상태 처리 개선
- skeleton 컴포넌트 확장

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

src/components/production/WorkerScreen/MaterialInputModal.tsx

@@ -12,7 +12,7 @@
 
 import { useState, useEffect, useCallback } from 'react';
 import { Loader2 } from 'lucide-react';
-import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
+import { ContentSkeleton } from '@/components/ui/skeleton';
 import {
   Dialog,
   DialogContent,
@@ -200,7 +200,7 @@ export function MaterialInputModal({
             </h3>
 
             {isLoading ? (
-              <ContentLoadingSpinner text="자재 목록을 불러오는 중..." />
+              <ContentSkeleton type="table" rows={4} />
             ) : materials.length === 0 ? (
               <div className="border rounded-lg">
                 <Table>

src/components/production/WorkerScreen/ProcessDetailSection.tsx

@@ -14,7 +14,7 @@
 
 import { useState, useEffect, useCallback } from 'react';
 import { ChevronDown, Loader2 } from 'lucide-react';
-import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
+import { ContentSkeleton } from '@/components/ui/skeleton';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -176,7 +176,7 @@ export function ProcessDetailSection({
       {/* 공정 단계 목록 */}
       <div className="space-y-2">
         {isLoading ? (
-          <ContentLoadingSpinner text="공정 단계를 불러오는 중..." />
+          <ContentSkeleton type="list" rows={4} />
         ) : steps.length === 0 ? (
           <div className="py-8 text-center text-gray-500">
             등록된 공정 단계가 없습니다.

src/components/production/WorkerScreen/index.tsx

@@ -12,7 +12,7 @@
 
 import { useState, useMemo, useCallback, useEffect } from 'react';
 import { ClipboardList, PlayCircle, CheckCircle2, AlertTriangle } from 'lucide-react';
-import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
+import { ContentSkeleton } from '@/components/ui/skeleton';
 import { Card, CardContent } from '@/components/ui/card';
 import {
   Select,
@@ -281,7 +281,7 @@ export default function WorkerScreen() {
             </Select>
           </div>
           {isLoading ? (
-            <ContentLoadingSpinner text="작업 목록을 불러오는 중..." />
+            <ContentSkeleton type="cards" rows={4} />
           ) : sortedWorkOrders.length === 0 ? (
             <Card>
               <CardContent className="py-12 text-center text-muted-foreground">