fix(deps): bump shell-quote to 1.8.4 (GHSA-w7jw-789q-3m8p)

Patches the critical shell-quote advisory (quote() does not escape
newlines in object .op values, CVSS 8.1). shell-quote is a dev/build-only
transitive dependency (react-dev-utils / launch-editor) and is not present
in the production image or the browser bundle, so there is no runtime
exposure; this clears the alert and the dev-time risk. Lockfile-only change
verified to install with shell-quote resolving to 1.8.4.

frontend/package-lock.json

@@ -20347,9 +20347,9 @@
       }
     },
     "node_modules/shell-quote": {
-      "version": "1.8.3",
-      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.8.3.tgz",
-      "integrity": "sha512-ObmnIF4hXNg1BqhnHmgbDETF8dLPCggZWBjkQfhZpbszZnYur5DUljTcCHii5LC3J5E0yeO/1LIMyH+UvHQgyw==",
+      "version": "1.8.4",
+      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.8.4.tgz",
+      "integrity": "sha512-VsC6n6vz1ihYYyZZwX7YZSF5l5x36ca17OC+a69h94YqB7X6XLwf+5MOgynYir2SLFUbl8gIYvBo8K8RoNQ6bQ==",
       "dev": true,
       "license": "MIT",
       "engines": {