fix: resolve Expo SDK 54 compatibility issues and React 19 JSX runtime errors

client/babel.config.js

@@ -0,0 +1,9 @@
+module.exports = function (api) {
+  api.cache(true);
+  return {
+    presets: ['babel-preset-expo'],
+    plugins: [
+      ['@babel/plugin-transform-react-jsx', { runtime: 'automatic' }]
+    ]
+  };
+};