단위테스트 오류 수정.

apps/cs/src/pages/image/ui/image-form.tsx

@@ -104,6 +104,7 @@ function ImageForm({ form, imgSn, ...props }: ImageFormProps) {
                           value={field.value ?? ""}
                           className="!text-[1.3rem]"
                           placeholder="이미지명을 입력해주세요"
+                          maxLength={100}
                         />
                       </FormControl>
                     </FormItem>
@@ -126,11 +127,17 @@ function ImageForm({ form, imgSn, ...props }: ImageFormProps) {
                           min={0}
                           max={9999}
                           value={field.value ?? ""}
-                          onChange={(e) =>
-                            field.onChange(parseInt(e.target.value))
-                          }
+                          onChange={(e) => {
+                            const value = parseInt(e.target.value);
+                            if (value > 9999) {
+                              field.onChange(9999);
+                            } else {
+                              field.onChange(value);
+                            }
+                          }}
                           className="w-[12rem] !text-[1.3rem]"
                           placeholder="정렬순서 입력"
+                          maxLength={4}
                         />
                       </FormControl>
                     </FormItem>

apps/cs/src/pages/site/ui/modify-page.tsx

@@ -4,6 +4,7 @@ import { useRouter } from "next/navigation";
 import { useForm } from "react-hook-form";
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useQuery, useQueryClient } from "@tanstack/react-query";
+import { useEffect } from "react";
 import { SiteApi, siteFormSchema, type SiteFormData } from "@/entities/site";
 import { useAlertStore, useMutationWrapper } from "@/shared/lib";
 import { ENDPOINT } from "@/shared/config";
@@ -27,6 +28,12 @@ function ModifyPage({ siteId }: { siteId: string }) {
     enabled: !!siteId,
   });
 
+  useEffect(() => {
+    if (siteDetail === undefined && siteId) {
+      alert("사이트 정보를 찾을 수 없습니다.", () => router.push("/site"));
+    }
+  }, [siteDetail, siteId]);
+
   const { mutateAsync: updateSite } = useMutationWrapper({
     mutationFn: (data: SiteFormData) => SiteApi.updateSite(siteId, data),
     onSuccess: () => {