[Seedless-onboarding] - tests for useMPC hook

[schmanu]

What it solves

• Adds tests for the useInitMPC hook
• Connecting wallet after rehydration
• emitting correct events when switching chain
• initialization of MPC Core Kit

How to test it

• yarn test useMPC

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://web3authcoresdk_usempc_test--walletweb.review-wallet-web.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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