fix: support React Native (window without document)

[roymiloh]

Summary

Makes the SDK import, construct, and make requests on React Native. RN defines a limited window polyfill but has no document, localStorage, or window.location — so the SDK's typeof window === "undefined" guards (which only tell Node/SSR apart from browser) passed in RN and then touched globals that aren't there.

Analytics is disabled on React Native for now (returns a noop module); the rest of the SDK works.

Blockers fixed

1. Import-time crash — analytics.ts builds its shared state eagerly at module load, and the factory calls getAnalyticsConfigFromUrlParams() → window.location.search. Threw the moment the SDK was imported in RN. Now guarded with !window.location.
2. Construction-time crash — createAnalyticsModule runs trackInitializationEvent synchronously, reading document.referrer (optional chaining doesn't save an undeclared global → ReferenceError). The module now early-returns a noop { track, cleanup } on RN.
3. Per-request crash — the axios request interceptor read window.location.href guarded only by typeof window. Now guarded with && window.location.

Design note

Gating is on a new isReactNative = !isNode && typeof document === "undefined" flag, not a plain "no document" check. The SDK's analytics runs headless in Node (queue + flush), and there are tests for it; gating on document alone would have disabled Node analytics too. isReactNative targets precisely the window-without-a-DOM case the existing guards miss.

Known limitation

getAnalyticsSessionId falls back to a fresh UUID per call on RN (no localStorage), so the anonymous-visitor id isn't stable across requests there. It's try/catch-guarded so it won't crash, and authenticated flows use the token instead. A stable id on RN would need an injectable AsyncStorage-style persistence layer — out of scope here.

Testing

• New tests/unit/react-native.test.ts (3 tests) stubs a window-without-document env, re-imports the SDK, and asserts import + construction + analytics.track don't throw (fails without the fixes).
• Full suite 167 passed; typecheck, type-tests, build, and lint all clean.

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