[CLAUDE] PurchaseEvaluation: bo o "Ten ngan sach" o manual budget (UAT vong 4 - anh chot "cho ten ngan sach bo di nhe")

- PeDetailTabs Section 5 Dieu chinh ngan sach: bo input "Ten (khong bat buoc)"
  (user khong hieu "y nghia du phong la gi") - manual budget chi con So tien (VND).
  State manualName drop, payload budgetManualName: null. Ten cu phieu truoc van
  hien read-only, ve null khi Luu dieu chinh lan toi.
- PeHeaderForm: payload budgetManualName null + hasManual detect theo CA amount
  (phieu moi name=null sau khi bo o Ten -> van nhan dung manual mode).
- PeWorkspaceCreateView: khong doi (chua tung co o Ten, payload '' || null = null san).
- SHA256 mirror x2 app IDENTICAL, build tsc+vite x2 PASS.

fe-admin/src/components/pe/PeHeaderForm.tsx

@@ -101,7 +101,8 @@ export function PeHeaderForm({
 
   useEffect(() => {
     if (existing.data) {
-      const hasManual = existing.data.budgetManualName !== null
+      // S59: manual-mode detect theo CẢ amount (phiếu mới name=null sau khi bỏ ô Tên).
+      const hasManual = existing.data.budgetManualAmount !== null || existing.data.budgetManualName !== null
         || existing.data.budgetManualAmount !== null
       setForm({
         type: existing.data.type,
@@ -124,7 +125,7 @@ export function PeHeaderForm({
   const payloadBudgetFields = form.budgetManual
     ? {
         budgetId: null,
-        budgetManualName: form.budgetManualName || null,
+        budgetManualName: null, // S59 anh chốt bỏ "Tên ngân sách" — manual chỉ còn Số tiền
         budgetManualAmount: form.budgetManualAmount > 0 ? form.budgetManualAmount : null,
       }
     : {