fix: add npm overrides to align react + react-dom to 19.2.3

react-dom@19.2.7 has a hard peer dep on react@^19.2.7, breaking
npm ci when react is pinned to 19.2.3. npm overrides force both
packages to 19.2.3 so the lock file resolves cleanly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -27,6 +27,10 @@
     "react-native-screens": "~4.25.2",
     "tailwindcss": "~3.4.19"
   },
+  "overrides": {
+    "react": "19.2.3",
+    "react-dom": "19.2.3"
+  },
   "devDependencies": {
     "@babel/core": "^7.25.0",
     "@expo/metro-config": "~56.0.14",