fix: add react-dom and regenerate lock file without --legacy-peer-deps

expo-router's radix-ui deps require react-dom as a peer. The lock file
was previously generated with --legacy-peer-deps which omitted peer dep
entries, causing `npm ci` on CI to fail with "Missing from lock file".

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

package.json

@@ -16,6 +16,7 @@
     "expo-status-bar": "~56.0.4",
     "nativewind": "^4.2.6",
     "react": "19.2.3",
+    "react-dom": "^19.2.3",
     "react-native": "0.85.3",
     "react-native-reanimated": "4.3.1",
     "react-native-safe-area-context": "~5.7.0",