loop/webui: add prettier
diff --git a/loop/webui/package-lock.json b/loop/webui/package-lock.json
index 53b806f..b1a02d2 100644
--- a/loop/webui/package-lock.json
+++ b/loop/webui/package-lock.json
@@ -30,6 +30,7 @@
         "@web/test-runner-puppeteer": "^0.18.0",
         "autoprefixer": "^10.4.21",
         "esbuild": "^0.25.1",
+        "prettier": "3.5.3",
         "typescript": "^5.8.2"
       }
     },
@@ -5600,6 +5601,22 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/prettier": {
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.5.3.tgz",
+      "integrity": "sha512-QQtaxnoDJeAkDvDKWCLiwIXkTgRhwYDEQCghU9Z6q03iyek/rxRh/2lC3HB7P8sWT2xC/y5JDctPLBIGzHKbhw==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",