Initial commit: unionflow-mobile-apps

Application Flutter complète (sans build artifacts).

Signed-off-by: lions dev Team

lib/features/finance_workflow/domain/usecases/reject_transaction.dart

@@ -0,0 +1,33 @@
+/// Use case: Rejeter une transaction
+library reject_transaction;
+
+import 'package:dartz/dartz.dart';
+import 'package:injectable/injectable.dart';
+import '../../../../core/error/failures.dart';
+import '../entities/transaction_approval.dart';
+import '../repositories/finance_workflow_repository.dart';
+
+@lazySingleton
+class RejectTransaction {
+  final FinanceWorkflowRepository repository;
+
+  RejectTransaction(this.repository);
+
+  Future<Either<Failure, TransactionApproval>> call({
+    required String approvalId,
+    required String reason,
+  }) async {
+    if (approvalId.isEmpty) {
+      return Left(ValidationFailure('ID approbation requis'));
+    }
+
+    if (reason.trim().isEmpty) {
+      return Left(ValidationFailure('Raison du rejet requise'));
+    }
+
+    return await repository.rejectTransaction(
+      approvalId: approvalId,
+      reason: reason,
+    );
+  }
+}