fix(WEB): Next.js 빌드 오류 수정

- xlsx 패키지 설치 (LocationListPanel.tsx에서 사용)
- createContract 중복 선언 제거 (actions.ts)

package-lock.json

@@ -7629,17 +7629,6 @@
         }
       }
     },
-    "node_modules/next-intl/node_modules/@swc/helpers": {
-      "version": "0.5.18",
-      "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.18.tgz",
-      "integrity": "sha512-TXTnIcNJQEKwThMMqBXsZ4VGAza6bvN4pa41Rkqoio6QBKMvo+5lexeTMScGCIxtzgQJzElcvIltani+adC5PQ==",
-      "license": "Apache-2.0",
-      "optional": true,
-      "peer": true,
-      "dependencies": {
-        "tslib": "^2.8.0"
-      }
-    },
     "node_modules/next/node_modules/postcss": {
       "version": "8.4.31",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",