[CLAUDE] PurchaseEvaluation: go han hanh dong "Tu choi" - chi con Duyet hoac Tra lai (UAT anh Kiet S60 14:14)

- Domain policy: xoa MOI transition -> TuChoi o ca 4 policy (NccOnly + NccWithPlan + ForV2Schema + FromDefinition) -> NextPhases het tra TuChoi, nut FE tu bien mat
- Service guard S60: chan targetPhase=TuChoi moi caller ke ca Admin (dung truoc moi branch — spec bo han, khong escape hatch); message huong dan dung Tra lai / Xoa nhap
- FE x2 app: filter phong thu next.filter(p != TuChoi) PeWorkflowPanel (SHA256 identical); dialog/isCancel giu dead-safe de flip lai de
- Enum TuChoi + phieu TuChoi cu + tab filter "Tu choi" GIU display (data cu render binh thuong)
- SlaExpiryJob chi dung Contract — PE khong auto-TuChoi, khong anh huong
- Tests spec-change cung commit: Domain flip BothPolicies_TuChoi_RemovedFromAllTransitions_S60 + NEW V2SchemaPolicy fact; Infra NEW TargetTuChoi_WithRejectDecision_Throws_TuChoiRemoved_S60 (guard #45 test cu giu nguyen PASS — van dung truoc)
- Test 254 -> 256 PASS (59 Domain + 197 Infra)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

fe-user/src/components/pe/PeWorkflowPanel.tsx

@@ -136,7 +136,10 @@ export function PeWorkflowPanel({
     onError: e => toast.error(getErrorMessage(e)),
   })
 
-  const next = evaluation.workflow.nextPhases
+  // UAT S60 (anh Kiệt 14:14): "bỏ luôn nút Từ chối — Duyệt hoặc Trả về thôi".
+  // BE policy đã gỡ TuChoi khỏi nextPhases; filter này = defense-in-depth FE
+  // (BE cũ cache / deploy lệch vẫn không lòi nút). Dialog/isCancel giữ dead-safe.
+  const next = evaluation.workflow.nextPhases.filter(p => p !== PurchaseEvaluationPhase.TuChoi)
   const flow = evaluation.approvalFlow
 
   return (