fix(mobile): hoist expo + correct @expo/metro-runtime version for SDK 52

PackageList.java generated by RN autolinking imported expo.core.ExpoModulesPackage
(old SDK <48 name). Root cause: RN CLI couldn't read expo's react-native.config.js
through the pnpm symlink (it lives at .pnpm/expo@52..../expo/react-native.config.js),
so it fell back to deriving the import path from expo's Android gradle namespace
("expo.core") + assumed class name (ExpoModulesPackage), producing a path that
doesn't exist (the actual class lives at expo.modules.ExpoModulesPackage).

Added "expo" to .npmrc public-hoist-pattern so RN's autolinking can resolve
expo's react-native.config.js via the standard node_modules lookup. That config
explicitly sets packageImportPath to the correct expo.modules.ExpoModulesPackage.

Also corrected @expo/metro-runtime from 55.0.11 (added blindly earlier) to ~4.0.1
which is the SDK-52-aligned version.

apps/mobile/package.json

@@ -22,7 +22,7 @@
     "@chat-app/db-types": "workspace:*",
     "@chat-app/shared": "workspace:*",
     "@config-plugins/react-native-webrtc": "^10.0.0",
-    "@expo/metro-runtime": "^55.0.11",
+    "@expo/metro-runtime": "^4.0.1",
     "@livekit/react-native": "^2.10.3",
     "@livekit/react-native-webrtc": "^144.0.0",
     "@react-native-async-storage/async-storage": "^1.23.1",