fix: bump react to 19.2.7 to satisfy react-dom peer dependency

react-dom@19.2.7 requires react@^19.2.7; the project had 19.2.3 which
caused an ERESOLVE conflict on npm install.

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

package.json

@@ -15,7 +15,7 @@
     "expo-secure-store": "~56.0.4",
     "expo-status-bar": "~56.0.4",
     "nativewind": "^4.2.6",
-    "react": "19.2.3",
+    "react": "19.2.7",
     "react-native": "0.85.3",
     "react-native-reanimated": "4.3.1",
     "react-native-safe-area-context": "~5.7.0",