Fix Jest mock for mobile SDK demo

[transphorm]

Summary

• update the mobile-sdk-demo Jest setup to base the @selfxyz/mobile-sdk-alpha mock on the real implementation while keeping deterministic helpers
• stub native/ESM-only dependencies so the refreshed mock can run under Jest without transform errors

Testing

• yarn workspace mobile-sdk-demo test

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https://chatgpt.com/codex/tasks/task_b_68dc5bbb2600832d81ff4f7fcbb51ddf

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/fix-failing-pipelines-for-branch

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