feat: required assets button

[matthewwalsh0]

Summary

Add a new Send Calls - Required Assets button to the EIP-5792 send calls section for testing the auxiliaryFunds.requiredAssets capability.

Changes

• Add new button that sends a wallet_sendCalls request with the requiredAssets capability.
• Button is only enabled when connected to chains with a USDC token.
• Request includes 0.1 USDC as a required asset.

Screenshot

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Note

Low Risk
Low risk UI/test harness change that only adds a new wallet_sendCalls request variant and minor enable/disable logic; no backend or security-sensitive logic is modified.

Overview
Adds a new “Send Calls - Required Assets” button in the EIP-5792 sendCalls UI that submits wallet_sendCalls with capabilities.auxiliaryFunds.requiredAssets, requesting 0.1 USDC (chain-specific address) as an ERC-20 required asset.

Introduces a per-chain USDC address map, updates USDC-related approval calls to explicitly target mainnet USDC, and refactors submitRequest to optionally attach calls and capabilities params while enabling/disabling the new button based on connection and supported chain.

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