chore: align example to React Native 0.87.0 and bump dependencies

[NandanPrabhu]

Summary

Aligns the example app and SDK toolchain to React Native 0.87.0 (New-Architecture only) and updates dependencies to latest stable within compatible majors. Intended to land in v6-development as part of the v6 major.

Changes

React Native 0.87.0

• Pin react-native and @react-native/* packages to exact 0.87.0 in both the library and the example app (matching the official RN 0.87 upgrade template).
• Example Android toolchain aligned with RN 0.87: Kotlin 2.2.0, Gradle 9.4.1, AGP 9 opt-outs.
• Regenerated the example iOS Podfile.lock for 0.87.0.

Dependency alignment & bumps

• Ran @rnx-kit/align-deps --requirements react-native@0.87 to align the RN ecosystem (React pinned to 19.2.3, react-dom matched, metro ^0.87.0, etc.).
• Bumped root + example dependencies to latest stable within compatible majors (e.g. typescript-eslint 8.70, release-it 21, expo 57, @testing-library/jest-dom 7, metro 0.87).
• Held back toolchain-breaking majors for compatibility: TypeScript 7 (native-port preview), ESLint 10, Babel 8, Jest 30, webpack-dev-server 6.

⚠️ Breaking change (intentional, for v6)

• peerDependencies floor raised to react-native >=0.87.0 / react >=19.0.0. Apps below RN 0.87 must upgrade or stay on react-native-auth0@5.x.
• Documented in README.md and MIGRATION_GUIDE.md (New-Architecture-only requirement + upgrade steps).

Verification

• yarn typecheck ✓ · yarn test (782/782) ✓ · yarn build ✓
• Example Android assembleDebug ✓ · example iOS pod install ✓

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