Merge prod_v2 (AcceptModal/MilestoneRow layout) into integration

Conflicts resolved keeping the hardened/current side:
- docker-compose.yml: kept new-one's db-backup service, hardened env
  (ENVIRONMENT/DEV_LOGIN/CORS/issuer var) and build args; prod_v2's
  8083/8085 dev port remaps dropped as they conflict with the hardened
  Casdoor issuer expectation.
- AcceptModal.tsx: kept the per-item target_project model (43ff048) over
  prod_v2's older projUnion candidate-project logic, kept the
  authenticated file upload/download blocks, and adopted prod_v2's
  sticky footer.

frontend/src/components/MilestoneRow.tsx

@@ -12,15 +12,19 @@ export interface MilestoneRowProps {
 // یک ردیف مرحله‌ی پرداخت: تاریخ + مبلغ + دکمه‌ی حذف
 export function MilestoneRow({ milestone, onChange, onRemove, disabled = false }: MilestoneRowProps) {
   return (
-    <div className="milestone-row">
-      <JalaliDatePicker
-        value={milestone.when_iso}
-        onChange={(iso) => onChange({ ...milestone, when_iso: iso })}
-        placeholder="تاریخ"
-        className="w-36 shrink-0"
-        disabled={disabled}
-      />
-      <div className="ms-amount-wrap">
+    <div className="flex items-start gap-3 w-full my-2">
+      {/* کادر انتخاب تاریخ */}
+      <div className="w-36 shrink-0">
+        <JalaliDatePicker
+          value={milestone.when_iso}
+          onChange={(iso) => onChange({ ...milestone, when_iso: iso })}
+          placeholder="تاریخ"
+          disabled={disabled}
+        />
+      </div>
+
+      {/* کادر ورود مبلغ و حروف زیر آن */}
+      <div className="flex-1 min-w-0">
         <NumberInput
           value={milestone.amount}
           onChange={(amount) => onChange({ ...milestone, amount })}
@@ -29,11 +33,18 @@ export function MilestoneRow({ milestone, onChange, onRemove, disabled = false }
           disabled={disabled}
         />
       </div>
+
+      {/* دکمه حذف */}
       {!disabled && (
-        <button type="button" className="ms-x" title="حذف" onClick={onRemove}>
+        <button
+          type="button"
+          className="mt-2 text-red-500 hover:text-red-700 text-lg font-bold shrink-0 px-1 transition-colors"
+          title="حذف"
+          onClick={onRemove}
+        >
           ×
         </button>
       )}
     </div>
   );
-}
+}