fix: drop uuid dependency so requests work on React Native

[roymiloh]

Summary

Follow-up to the React Native support work. uuid v13's v4() calls crypto.getRandomValues() internally, which React Native (Hermes) does not provide without the react-native-get-random-values polyfill — it throws crypto.getRandomValues() not supported. This ran on every request in the axios request interceptor (axios-client.ts), so all requests failed on React Native.

Fix

• uuid was used in exactly one place: a requestId used only for in-iframe postMessage request/response correlation. It needs to be unique, not cryptographically random.
• Replaced uuidv4() with the existing generateUuid() (Math.random-based, in common.ts, already used for session/anonymous ids) — works in every environment.
• Dropped the uuid dependency entirely (package.json + lockfile), so the SDK no longer depends on crypto.getRandomValues and consumers don't need a polyfill.

Testing

• New test drives a request with crypto stubbed to undefined (the RN condition) and asserts it resolves and still attaches a correlation id.
• Lockfile change is only the uuid removal.
• Full suite 168 passed; typecheck, type-tests, build, and lint all clean.

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