이벤트 생성 플로우 수정 - 채널 선택 후 콘텐츠 미리보기/편집 단계 추가

- AI 이벤트 추천 -> 배포채널 선택 -> 콘텐츠 미리보기 -> 콘텐츠 편집 -> 최종승인 순서로 변경
- 우리동네TV, 지니TV, SNS 선택 시에만 콘텐츠 단계 진입하도록 조건부 분기 추가
- ContentPreviewStep, ContentEditStep 컴포넌트 임포트 및 funnel에 통합

src/app/(main)/events/create/page.tsx

@@ -4,6 +4,8 @@ import { useFunnel } from '@use-funnel/browser';
 import { useRouter } from 'next/navigation';
 import ObjectiveStep from './steps/ObjectiveStep';
 import RecommendationStep from './steps/RecommendationStep';
+import ContentPreviewStep from './steps/ContentPreviewStep';
+import ContentEditStep from './steps/ContentEditStep';
 import ChannelStep from './steps/ChannelStep';
 import ApprovalStep from './steps/ApprovalStep';
 
@@ -41,6 +43,8 @@ export default function EventCreatePage() {
   const funnel = useFunnel<{
     objective: EventData;
     recommendation: EventData;
+    contentPreview: EventData;
+    contentEdit: EventData;
     channel: EventData;
     approval: EventData;
   }>({
@@ -79,7 +83,46 @@ export default function EventCreatePage() {
       channel={({ context, history }) => (
         <ChannelStep
           onNext={(channels) => {
-            history.push('approval', { ...context, channels });
+            // 우리동네TV, 지니TV, SNS 중 하나라도 포함되어 있으면 contentPreview로
+            const needsContent = channels.some((ch) =>
+              ['uriTV', 'genieTV', 'sns'].includes(ch)
+            );
+
+            if (needsContent) {
+              history.push('contentPreview', { ...context, channels });
+            } else {
+              history.push('approval', { ...context, channels });
+            }
+          }}
+          onBack={() => {
+            history.go(-1);
+          }}
+        />
+      )}
+      contentPreview={({ context, history }) => (
+        <ContentPreviewStep
+          title={context.recommendation?.title || ''}
+          prize={context.recommendation?.prize || ''}
+          onNext={(imageStyle) => {
+            history.push('contentEdit', {
+              ...context,
+              contentPreview: { imageStyle },
+            });
+          }}
+          onSkip={() => {
+            history.push('approval', context);
+          }}
+          onBack={() => {
+            history.go(-1);
+          }}
+        />
+      )}
+      contentEdit={({ context, history }) => (
+        <ContentEditStep
+          initialTitle={context.recommendation?.title || ''}
+          initialPrize={context.recommendation?.prize || ''}
+          onNext={(contentEdit) => {
+            history.push('approval', { ...context, contentEdit });
           }}
           onBack={() => {
             history.go(-1);