refactor: 코드베이스 정리 및 에러 처리 개선

- API 클라이언트 및 인증 인터셉터 에러 처리 강화
- 의존성 주입 실패 시에도 앱 실행 가능하도록 개선
- 사용하지 않는 레거시 UI 컴포넌트 및 화면 제거
- pubspec.yaml 의존성 업데이트

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/screens/common/custom_widgets/data_table_card.dart

@@ -1,32 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:superport/screens/common/theme_tailwind.dart';
-
-// 데이터 테이블 카드
-class DataTableCard extends StatelessWidget {
-  final Widget child;
-  final String? title;
-  final double? width;
-
-  const DataTableCard({Key? key, required this.child, this.title, this.width})
-    : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: width,
-      decoration: AppThemeTailwind.cardDecoration,
-      margin: const EdgeInsets.only(bottom: 16.0),
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
-          if (title != null)
-            Padding(
-              padding: const EdgeInsets.all(16.0),
-              child: Text(title!, style: AppThemeTailwind.subheadingStyle),
-            ),
-          Padding(padding: const EdgeInsets.all(16.0), child: child),
-        ],
-      ),
-    );
-  }
-}

lib/screens/common/custom_widgets/page_title.dart

@@ -1,27 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:superport/screens/common/theme_tailwind.dart';
-
-// 페이지 타이틀 위젯
-class PageTitle extends StatelessWidget {
-  final String title;
-  final Widget? rightWidget;
-  final double? width;
-
-  const PageTitle({Key? key, required this.title, this.rightWidget, this.width})
-    : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: width,
-      margin: const EdgeInsets.only(bottom: 16.0),
-      child: Row(
-        mainAxisAlignment: MainAxisAlignment.spaceBetween,
-        children: [
-          Text(title, style: AppThemeTailwind.headingStyle),
-          if (rightWidget != null) rightWidget!,
-        ],
-      ),
-    );
-  }
-}