chore: update refs to viem 2.20 to 2.26

[Zer0dot]

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Updates viem version referenced in docs.

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PR-Codex overview

This PR primarily updates the version of the viem package from 2.22.6 to 2.26.0 across various files and adjusts related documentation accordingly. It also includes minor code changes in the default middleware and local-account signer.

Detailed summary

• Updated viem version in package.json and yarn.lock.
• Changed documentation to reflect viem version update in multiple .mdx files.
• Adjusted parameter name from contractAddress to address in signer.signAuthorization call in 7702signer.ts.
• Updated Authorization method in local-account.ts to use signAuthorization.

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[jakehobbs]

probably should update the peer deps specified the packages to the same version:

aa-sdk/account-kit/core/package.json

Line 65 in f9293b2

"viem": "^2.22.6",

as well as the dev dep for the monorepo:

aa-sdk/package.json

Line 83 in f9293b2

"viem": "2.22.6",