fix(wallet-client): handle permits in sendCalls action, add clarifying docs

[dancoombs]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR enhances the documentation and implementation of the sendCalls functionality, particularly addressing the handling of permits when using an ERC-20 paymaster in pre-operation mode. It provides clearer guidance on using prepareCalls and adds a new signature handling process.

Detailed summary

• Added a note in sendCalls.mdx about using autoPermit with ERC-20 paymaster.
• Updated documentation in useSendCalls.ts regarding permit handling.
• Changed import of SmartAccountSigner in sendCalls.ts to inline type import.
• Introduced signSignatureRequest import in sendCalls.ts.
• Modified sendCalls function to handle paymaster permits by signing the signature request if calls.type is paymaster-permit.

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