[CLAUDE] PE workflow 3-button Duyệt/Trả lại/Từ chối (Task 4)

User chỉ thị thay 2-button hiện tại bằng 3 hành động rõ ràng:
- Duyệt = forward phase tiếp theo
- Trả lại = về DangSoanThao + Drafter sửa → workflow tự jump tới phase
  đã reject (smart reject Mig 16 pattern + clear N-stage rows)
- Từ chối = phiếu khoá hoàn toàn (Phase=TuChoi → 17 handler Mig 16 lock
  edit). Drafter phải tạo phiếu mới.

Domain (PurchaseEvaluationPolicy.cs):
- NccOnly + NccWithPlan: thêm (X → TuChoi) transition cho mọi phase
  trung gian (ChoPurchasing/ChoCCM/ChoCEODuyetNCC/ChoDuAn/ChoCEODuyetPA)
  với roles của phase đó. Trước đây chỉ DangSoanThao → TuChoi (Drafter).
- FromDefinition expand: mỗi step (trừ DangSoanThao) thêm
  (step.Phase → TuChoi) với roles của step.

Service (PurchaseEvaluationWorkflowService.cs):
- Reject branch tách 2 case:
  * target=TuChoi → giữ nguyên (KHÔNG override + KHÔNG set
    RejectedFromPhase + KHÔNG clear N-stage rows). Phiếu khoá vĩnh viễn.
  * target khác (thường DangSoanThao) → smart reject (set
    RejectedFromPhase + force DangSoanThao + clear N-stage rows).

FE (PeWorkflowPanel.tsx, fe-admin + fe-user mirror):
- next.phases render 3 button rõ ràng:
  * "✓ Duyệt → <label>" brand (forward)
  * "← Trả lại (về Drafter sửa)" red (target=DangSoanThao + isSendBack)
  * "✗ Hủy / Từ chối" red (target=TuChoi)
- Decision logic: target=TuChoi || isSendBack → Reject (2), else Approve (1)
- Dialog confirm:
  * Title rõ theo loại hành động
  * Cancel case: warning red "Phiếu sẽ bị khoá hoàn toàn"
  * SendBack case: hint amber "Phiếu sẽ về Đang soạn thảo, Drafter sửa
    rồi trình lại — workflow tự jump tới phase này"

Tests update + add 1 test mới:
- Reject_Sets_RejectedFromPhase_And_Forces_DangSoanThao →
  Reject_To_DangSoanThao_Sets_RejectedFromPhase_TraLai (rename + change
  target từ TuChoi → DangSoanThao để test Trả lại pattern)
- + Reject_To_TuChoi_Locks_Permanently_No_RejectedFromPhase (NEW test
  Từ chối — phase=TuChoi + RejectedFromPhase null)
- NStage_Reject_Clears_InnerStep_Rows_At_Phase: target TuChoi →
  DangSoanThao (test Trả lại + clear N-stage rows pattern)

Verify:
- dotnet build 0 error
- dotnet test 95 → **96 pass** (+1 test mới Từ chối)
- npm build fe-admin + fe-user pass

Pending Task 2: Sample data seed N-stage.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Backend/SolutionErp.Domain/PurchaseEvaluations/PurchaseEvaluationPolicy.cs

@@ -56,14 +56,20 @@ public static class PurchaseEvaluationPolicies
             [(PurchaseEvaluationPhase.DangSoanThao, PurchaseEvaluationPhase.ChoPurchasing)] = [AppRoles.Drafter, AppRoles.DeptManager],
             [(PurchaseEvaluationPhase.DangSoanThao, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Drafter, AppRoles.DeptManager],
 
+            // Phase trung gian: 3 hành động — Duyệt forward / Trả lại Drafter (DangSoanThao) / Từ chối hoàn toàn (TuChoi).
+            // Trả lại = smart reject pattern Mig 16 (set RejectedFromPhase + về DangSoanThao + Drafter sửa).
+            // Từ chối = phiếu khoá hoàn toàn (Phase=TuChoi → 17 handler Mig 16 lock edit).
             [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.ChoCCM)] = [AppRoles.Procurement],
             [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.Procurement],
+            [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Procurement],
 
             [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.ChoCEODuyetNCC)] = [AppRoles.CostControl],
             [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.CostControl],
+            [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.CostControl],
 
             [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.DaDuyet)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
             [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
+            [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
         },
         PhaseSla: DefaultSla,
         ActivePhases:
@@ -85,20 +91,26 @@ public static class PurchaseEvaluationPolicies
             [(PurchaseEvaluationPhase.DangSoanThao, PurchaseEvaluationPhase.ChoPurchasing)] = [AppRoles.Drafter, AppRoles.DeptManager],
             [(PurchaseEvaluationPhase.DangSoanThao, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Drafter, AppRoles.DeptManager],
 
+            // Phase trung gian: 3 hành động — Duyệt forward / Trả lại / Từ chối (xem comment NccOnly).
             [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.ChoDuAn)] = [AppRoles.Procurement],
             [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.Procurement],
+            [(PurchaseEvaluationPhase.ChoPurchasing, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Procurement],
 
             [(PurchaseEvaluationPhase.ChoDuAn, PurchaseEvaluationPhase.ChoCCM)] = [AppRoles.ProjectManager],
             [(PurchaseEvaluationPhase.ChoDuAn, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.ProjectManager],
+            [(PurchaseEvaluationPhase.ChoDuAn, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.ProjectManager],
 
             [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.ChoCEODuyetPA)] = [AppRoles.CostControl],
             [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.CostControl],
+            [(PurchaseEvaluationPhase.ChoCCM, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.CostControl],
 
             [(PurchaseEvaluationPhase.ChoCEODuyetPA, PurchaseEvaluationPhase.ChoCEODuyetNCC)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
             [(PurchaseEvaluationPhase.ChoCEODuyetPA, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
+            [(PurchaseEvaluationPhase.ChoCEODuyetPA, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
 
             [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.DaDuyet)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
             [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.DangSoanThao)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
+            [(PurchaseEvaluationPhase.ChoCEODuyetNCC, PurchaseEvaluationPhase.TuChoi)] = [AppRoles.Director, AppRoles.AuthorizedSigner],
         },
         PhaseSla: DefaultSla,
         ActivePhases:
@@ -171,17 +183,21 @@ public static class PurchaseEvaluationPolicyRegistry
                 transitions[(prev.Value, s.Phase)] = roles;
                 if (userIds.Length > 0) userTransitions[(prev.Value, s.Phase)] = userIds;
 
-                // Reject path back to Drafter (common pattern)
+                // 3 hành động phase trung gian — Duyệt forward + Trả lại Drafter + Từ chối hoàn toàn
                 if (prev.Value != PurchaseEvaluationPhase.DangSoanThao && s.Phase != PurchaseEvaluationPhase.DangSoanThao)
                 {
                     transitions.TryAdd((s.Phase, PurchaseEvaluationPhase.DangSoanThao), roles);
+                    transitions.TryAdd((s.Phase, PurchaseEvaluationPhase.TuChoi), roles);
                     if (userIds.Length > 0)
+                    {
                         userTransitions.TryAdd((s.Phase, PurchaseEvaluationPhase.DangSoanThao), userIds);
+                        userTransitions.TryAdd((s.Phase, PurchaseEvaluationPhase.TuChoi), userIds);
+                    }
                 }
             }
             prev = s.Phase;
         }
-        // First step có thể reject to TuChoi
+        // First step (DangSoanThao) — Drafter có thể TuChoi (huỷ phiếu)
         if (steps.Count > 0)
             transitions.TryAdd((steps[0].Phase, PurchaseEvaluationPhase.TuChoi),
                 [AppRoles.Drafter, AppRoles.DeptManager]);