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/models/user_model.g.dart

@@ -11,6 +11,7 @@ _$UserImpl _$$UserImplFromJson(Map<String, dynamic> json) => _$UserImpl(
       name: json['name'] as String,
       email: json['email'] as String?,
       phone: json['phone'] as String?,
+      companyName: json['companyName'] as String?,
       username: json['username'] as String? ?? '',
       role: $enumDecodeNullable(_$UserRoleEnumMap, json['role']) ??
           UserRole.staff,
@@ -29,6 +30,7 @@ Map<String, dynamic> _$$UserImplToJson(_$UserImpl instance) =>
       'name': instance.name,
       'email': instance.email,
       'phone': instance.phone,
+      'companyName': instance.companyName,
       'username': instance.username,
       'role': _$UserRoleEnumMap[instance.role]!,
       'isActive': instance.isActive,