replace yarn with npm

mobile/.yarnclean

@@ -1,40 +0,0 @@
-# test directories
-__tests__
-test
-tests
-powered-test
-
-# asset directories
-doc
-website
-
-# examples
-example
-examples
-
-# code coverage directories
-coverage
-.nyc_output
-
-# build scripts
-Makefile
-Gulpfile.js
-Gruntfile.js
-
-# configs
-appveyor.yml
-circle.yml
-codeship-services.yml
-codeship-steps.yml
-wercker.yml
-.tern-project
-.editorconfig
-.eslintrc
-.jshintrc
-.flowconfig
-.documentup.json
-.yarn-metadata.json
-.travis.yml
-
-# misc
-*.md

mobile/package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "main": "index.js",
   "scripts": {
+    "prebuild": "expo prebuild --clean",
     "start": "expo start --dev-client",
     "start:go": "expo start",
     "android": "expo run:android",
@@ -13,6 +14,7 @@
     "@react-native-async-storage/async-storage": "2.2.0",
     "@react-navigation/native": "^7.1.28",
     "@react-navigation/native-stack": "^7.12.0",
+    "babel-preset-expo": "^54.0.10",
     "expo": "^54.0.0",
     "expo-apple-authentication": "~8.0.8",
     "expo-auth-session": "~7.0.10",