web: migrate health notifications to js_interop; add browser hook

- Replace dart:js with package:js in health_check_service_web.dart\n- Implement showHealthCheckNotification in web/index.html\n- Pin js dependency to ^0.6.7 for flutter_secure_storage_web compatibility

auth: harden AuthInterceptor + tests

- Allow overrideAuthRepository injection for testing\n- Normalize imports to package: paths\n- Add unit test covering token attach, 401→refresh→retry, and failure path\n- Add integration test skeleton gated by env vars

ui/data: map User.companyName to list column

- Add companyName to domain User\n- Map UserDto.company?.name\n- Render companyName in user_list

cleanup: remove legacy equipment table + unused code; minor warnings

- Remove _buildFlexibleTable and unused helpers\n- Remove unused zipcode details and cache retry constant\n- Fix null-aware and non-null assertions\n- Address child-last warnings in administrator dialog

docs: update AGENTS.md session context

lib/domain/usecases/company/validate_company_deletion_usecase.dart

@@ -1,9 +1,10 @@
 import 'package:dartz/dartz.dart';
 import '../../../core/errors/failures.dart';
 import '../../../core/utils/hierarchy_validator.dart';
-import '../../../services/company_service.dart';
+import '../../repositories/company_repository.dart';
 import '../base_usecase.dart';
 import '../../../data/models/company/company_dto.dart';
+import '../../../models/company_model.dart';
 
 /// 회사 삭제 가능 여부 검증 파라미터
 class ValidateCompanyDeletionParams {
@@ -29,23 +30,21 @@ class CompanyDeletionValidationResult {
 
 /// 회사 삭제 가능 여부 검증 UseCase
 class ValidateCompanyDeletionUseCase extends UseCase<CompanyDeletionValidationResult, ValidateCompanyDeletionParams> {
-  final CompanyService _companyService;
+  // 레포지토리 기반으로 마이그레이션
+  final CompanyRepository _companyRepository;
 
-  ValidateCompanyDeletionUseCase(this._companyService);
+  ValidateCompanyDeletionUseCase(this._companyRepository);
 
   @override
   Future<Either<Failure, CompanyDeletionValidationResult>> call(ValidateCompanyDeletionParams params) async {
     try {
       final blockers = <String>[];
       
-      // 1. 자식 회사 존재 여부 확인
-      final response = await _companyService.getCompanies(
-        page: 1,
-        perPage: 1000,
-      );
-      
+      // 1. 전체 회사(계층 구성용) 조회
+      final companiesEither = await _companyRepository.getCompanyHierarchy(includeInactive: true);
+
       // CompanyDto 리스트로 변환 (검증용)
-      final companyResponses = response.items.map((company) => CompanyDto(
+      final companyResponses = companiesEither.getOrElse(() => <Company>[]).map((company) => CompanyDto(
         id: company.id ?? 0,
         name: company.name,
         address: company.address.toString(),
@@ -107,4 +106,4 @@ class ValidateCompanyDeletionUseCase extends UseCase<CompanyDeletionValidationRe
       ));
     }
   }
-}
+}