플레이스홀더 변경

frontend/components/admin/dashboard/ElementConfigSidebar.tsx

@@ -198,7 +198,7 @@ export function ElementConfigSidebar({ element, isOpen, onClose, onApply }: Elem
               value={customTitle}
               onChange={(e) => setCustomTitle(e.target.value)}
               onKeyDown={(e) => e.stopPropagation()}
-              placeholder="비워두면 자동 생성"
+              placeholder="제목을 입력해주세요."
               className="focus:border-primary focus:ring-primary w-full rounded-md border border-gray-300 px-3 py-2 text-sm focus:ring-1 focus:outline-none"
             />
           </div>