fix:분개 모달 금액 입력에 자동 콤마 포맷팅 추가

- 금액 입력 시 3자리마다 콤마 자동 추가
- type="number" → type="text"로 변경
- 금액 우측 정렬 (text-right)
- formatAmountInput/parseAmountInput 헬퍼 함수 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

resources/views/barobill/ecard/index.blade.php

@@ -366,6 +366,18 @@ className={`px-3 py-1.5 text-xs cursor-pointer hover:bg-purple-50 ${
 
         const formatCurrency = (val) => new Intl.NumberFormat('ko-KR').format(val || 0);
 
+        // 금액 입력 포맷팅 (콤마 추가)
+        const formatAmountInput = (value) => {
+            if (!value && value !== 0) return '';
+            return new Intl.NumberFormat('ko-KR').format(value);
+        };
+
+        // 금액 입력값 파싱 (콤마 제거)
+        const parseAmountInput = (value) => {
+            const cleaned = String(value).replace(/[^0-9.-]/g, '');
+            return parseFloat(cleaned) || 0;
+        };
+
         return (
             <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50">
                 <div className="bg-white rounded-xl shadow-xl w-full max-w-2xl max-h-[90vh] overflow-hidden">
@@ -402,10 +414,11 @@ className={`px-3 py-1.5 text-xs cursor-pointer hover:bg-purple-50 ${
                                         <div>
                                             <label className="block text-xs text-stone-500 mb-1">금액</label>
                                             <input
-                                                type="number"
-                                                value={split.amount}
-                                                onChange={(e) => updateSplit(index, { amount: parseFloat(e.target.value) || 0 })}
-                                                className="w-full px-3 py-2 border border-stone-200 rounded-lg text-sm focus:ring-2 focus:ring-purple-500 outline-none"
+                                                type="text"
+                                                value={formatAmountInput(split.amount)}
+                                                onChange={(e) => updateSplit(index, { amount: parseAmountInput(e.target.value) })}
+                                                className="w-full px-3 py-2 border border-stone-200 rounded-lg text-sm text-right focus:ring-2 focus:ring-purple-500 outline-none"
+                                                placeholder="0"
                                             />
                                         </div>
                                         <div>