fix: remove expo-linking plugin, add metro/babel config for EAS compat

- expo-linking config plugin doesn't exist in SDK 52 (scheme at top level)
- metro.config.js + babel.config.js needed for npx expo config to work
- This lets EAS CLI read config properly without fallback path

Author: ralyodio

mobile/app.json

@@ -56,13 +56,7 @@
     "plugins": [
       "expo-router",
       "expo-notifications",
-      "expo-background-fetch",
-      [
-        "expo-linking",
-        {
-          "scheme": "smshub"
-        }
-      ]
+      "expo-background-fetch"
     ],
     "extra": {
       "eas": {

mobile/babel.config.js

@@ -0,0 +1,6 @@
+module.exports = function (api) {
+  api.cache(true);
+  return {
+    presets: ['babel-preset-expo'],
+  };
+};

mobile/metro.config.js

@@ -0,0 +1,5 @@
+const { getDefaultConfig } = require('expo/metro-config');
+
+const config = getDefaultConfig(__dirname);
+
+module.exports = config;