fix: 매장 등록 폼 검증 실패 시 입력값 보존

서버 검증 에러 발생 시 fieldValues를 반환하고
각 입력 필드에 defaultValue로 바인딩하여 사용자 입력 유지

apps/web/src/app/stores/new/actions.ts

@@ -8,17 +8,25 @@ import type { CreateStoreDraftInput } from '@startover/domain';
 
 export type StoreFormState = {
   error?: string;
+  fieldValues?: {
+    listingTitle?: string;
+    regionClusterCode?: string;
+    industryLeafCode?: string;
+    roadAddress?: string;
+    depositAmount?: string;
+    monthlyRentAmount?: string;
+    premiumAmount?: string;
+    remainingLeaseMonths?: string;
+    exclusiveAreaSqm?: string;
+    floorLevel?: string;
+    kitchenEquipmentSummary?: string;
+  };
 };
 
 export async function createStoreDraftAction(
   _prevState: StoreFormState,
   formData: FormData,
 ): Promise<StoreFormState> {
-  const session = await auth();
-  if (!session?.user?.dbId) {
-    return { error: '로그인이 필요합니다.' };
-  }
-
   const listingTitle = (formData.get('listingTitle') as string | null)?.trim() ?? '';
   const regionClusterCode = (formData.get('regionClusterCode') as string | null) ?? '';
   const industryLeafCode = (formData.get('industryLeafCode') as string | null) ?? '';
@@ -32,6 +40,25 @@ export async function createStoreDraftAction(
   const kitchenEquipmentSummary =
     (formData.get('kitchenEquipmentSummary') as string | null)?.trim() ?? '';
 
+  const fieldValues = {
+    listingTitle,
+    regionClusterCode,
+    industryLeafCode,
+    roadAddress,
+    depositAmount: depositAmount ?? undefined,
+    monthlyRentAmount: monthlyRentAmount ?? undefined,
+    premiumAmount: premiumAmount ?? undefined,
+    remainingLeaseMonths: remainingLeaseMonths ?? undefined,
+    exclusiveAreaSqm: exclusiveAreaSqm ?? undefined,
+    floorLevel: floorLevel ?? undefined,
+    kitchenEquipmentSummary,
+  };
+
+  const session = await auth();
+  if (!session?.user?.dbId) {
+    return { error: '로그인이 필요합니다.', fieldValues };
+  }
+
   const input: CreateStoreDraftInput = {
     ownerUserId: session.user.dbId,
     listingTitle,
@@ -66,7 +93,7 @@ export async function createStoreDraftAction(
   const result = await createStoreDraftService(prisma, input);
 
   if (!result.ok) {
-    return { error: result.error.message };
+    return { error: result.error.message, fieldValues };
   }
 
   redirect(`/stores/${result.value.publicId}`);