store: add useWalletStore state transition tests

[CemAyyildiz]

Goal

Test setWallet, updateBalance, and disconnect state transitions in the wallet store.

Context

frontend/lib/store.ts.

Acceptance criteria

• New frontend/lib/__tests__/store.test.ts
• Reset store between tests
• Frontend tests pass

Out of scope

• localStorage persist middleware

Conflict rule

Only edit store.ts if a tiny export is needed for testing.

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[samjay8]

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[cythecode]

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Reviewed the issue in detail and have a strong full-stack background that aligns well with this task. No blockers on my end—I’m ready to jump in and submit a PR shortly. Please assign it to me.

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