fix: fix viem usage

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Project	Deployment	Actions	Updated (UTC)
mpp-abstract-mpp-demo	Ready	Preview, Comment	Mar 25, 2026 10:43pm

[cursor]

PR Summary

Medium Risk
Touches on-chain signing, contract reads/writes, and typed-data verification by switching to viem client methods and removing explicit chain: null overrides, which could affect transaction submission or chain selection if any callers relied on the old behavior.

Overview
Updates the MPP client/server integration to use viem's instance methods (e.g. publicClient.readContract, walletClient.writeContract, client.verifyTypedData, walletClient.signTypedData) instead of importing helpers from viem/actions.

Removes explicit chain: null overrides from contract write calls in charge/session flows, relying on the configured client chain instead, and adds a patch changeset (fix: clean up viem usage).

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[changeset-bot]

🦋 Changeset detected

Latest commit: 5b7247c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@abstract-foundation/mpp	Patch

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