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

.claude/agents/flutter-patterns.md

@@ -0,0 +1,87 @@
+# Superport Flutter Patterns v8.0
+
+## What This Really Is
+Project-specific code patterns and examples. Not an "agent", just templates.
+
+## Project Structure
+```
+lib/
+  data/      # API, DTOs
+  domain/    # Business logic, entities
+  screens/   # UI screens
+  widgets/   # Reusable components
+```
+
+## Common Patterns in This Project
+
+### API Call Pattern
+```dart
+Future<Either<Failure, List<EquipmentDto>>> getEquipments() async {
+  try {
+    final response = await _api.getEquipments();
+    return Right(response.items);
+  } catch (e) {
+    return Left(ServerFailure(e.toString()));
+  }
+}
+```
+
+### Controller Pattern
+```dart
+class EquipmentController extends ChangeNotifier {
+  List<EquipmentDto> _items = [];
+  bool _isLoading = false;
+  
+  Future<void> loadItems() async {
+    _isLoading = true;
+    notifyListeners();
+    
+    final result = await _useCase.getEquipments();
+    result.fold(
+      (failure) => _handleError(failure),
+      (data) => _items = data,
+    );
+    
+    _isLoading = false;
+    notifyListeners();
+  }
+}
+```
+
+### ShadCN UI Components
+```dart
+// ALWAYS use these, NEVER Flutter defaults
+StandardDataTable<T>()     // Not DataTable()
+ShadButton.outline()        // Not ElevatedButton()
+ShadSelect<String>()        // Not DropdownButton()
+```
+
+### Korean Validation
+```dart
+// Business registration number
+bool validateBusinessNumber(String number) {
+  if (number.length != 10) return false;
+  // Actual validation logic here
+  return true;
+}
+
+// Korean phone
+final phoneRegex = RegExp(r'^01[0-9]-?\d{3,4}-?\d{4}$');
+```
+
+## Backend Field Mapping (CRITICAL)
+```dart
+// MUST match backend exactly
+@JsonKey(name: 'companies_id') int? companiesId  // NOT company_id
+@JsonKey(name: 'models_id') int? modelsId        // NOT model_id
+```
+
+## Project-Specific Rules
+1. Clean Architecture: Domain → Data → Presentation
+2. Backend owns business logic
+3. Frontend just displays
+4. shadcn_ui components only
+5. Korean comments for complex logic
+
+---
+*Copy these patterns. They work in this project.*