feat(sdk-react): react native support with /native entry point (#123)

[ZeePearl56]

Summary

Adds React Native support to @wraith-protocol/sdk-react via a new /native subpath export. The existing web entry point is completely unchanged. 990 tests pass, 0 failures.

Changes

Platform abstraction layer (src/platform.ts)

• Defines PlatformStorage, PlatformCrypto, and Platform interfaces
• Default web implementation using Web Crypto API + localStorage
• Lazy getPlatform() / setPlatform() registry pattern (no circular deps)
• Exported from hooks.ts for consumer access

React Native platform (src/platform-native.ts)

• Storage via @react-native-async-storage/async-storage
• Crypto via expo-crypto (SHA-256) with fallback to globalThis.crypto.getRandomValues
• setup() installs polyfills: react-native-get-random-values, Buffer

New entry points

• src/native.ts — calls setPlatform(nativePlatform) then re-exports all hooks
• @wraith-protocol/sdk-react/native subpath export added to package.json exports and tsup.config.ts
• RN packages are externalized — no conditional-import errors in web bundles

Example: examples/stellar-react-native-receive/

• Bare React Native (no Expo Go) receive example using @wraith-protocol/sdk-react/native
• Full metro.config.js, babel.config.js, tsconfig.json setup
• Monorepo-compatible with local SDK aliasing

Files changed

File	Status
packages/sdk-react/src/platform.ts	new — platform abstraction interface + web impl
packages/sdk-react/src/platform-native.ts	new — React Native platform impl
packages/sdk-react/src/native.ts	new — /native entry point
packages/sdk-react/src/hooks.ts	modified — re-exports getPlatform/setPlatform/Platform
packages/sdk-react/src/env.d.ts	modified — added RN module type declarations
packages/sdk-react/package.json	modified — added ./native export
packages/sdk-react/tsup.config.ts	modified — added native.ts entry, RN externals
examples/stellar-react-native-receive/	new — bare RN receive example (9 files)

Verification

• ✅ pnpm build — all entry points build cleanly (index + native)
• ✅ pnpm test — 990 tests pass (0 failures, 5 skipped — same as before)
• ✅ Existing web hooks pass unchanged (useStellarStealthKeys, useStellarBalance)
• ✅ pnpm format:check — all files use Prettier style

Closes #123

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