➕(frontend) add libphonenumber-js for phone number formatting

Install JavaScript implementation of Google's libphonenumber for proper
international phone number validation and formatting.

src/frontend/package-lock.json

@@ -22,6 +22,7 @@
         "i18next-browser-languagedetector": "8.2.0",
         "i18next-parser": "9.3.0",
         "i18next-resources-to-backend": "1.2.1",
+        "libphonenumber-js": "1.12.9",
         "livekit-client": "2.15.2",
         "posthog-js": "1.256.2",
         "react": "18.3.1",
@@ -7207,6 +7208,12 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/libphonenumber-js": {
+      "version": "1.12.9",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.12.9.tgz",
+      "integrity": "sha512-VWwAdNeJgN7jFOD+wN4qx83DTPMVPPAUyx9/TUkBXKLiNkuWWk6anV0439tgdtwaJDrEdqkvdN22iA6J4bUCZg==",
+      "license": "MIT"
+    },
     "node_modules/lightningcss": {
       "version": "1.25.1",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.25.1.tgz",

src/frontend/package.json

@@ -29,6 +29,7 @@
     "i18next-resources-to-backend": "1.2.1",
     "livekit-client": "2.15.2",
     "posthog-js": "1.256.2",
+    "libphonenumber-js": "1.12.9",
     "react": "18.3.1",
     "react-aria-components": "1.10.1",
     "react-dom": "18.3.1",