Add top level HEADER component, with a nested wallet component.

[ronerlih]

📘 Story (required for top level issues pls)

As a check-in user, I'd like to connect my wallet on any chain, so that sign my transactions.

💬 Description

Add a (top level, always visible) header component, with a scoffold-eth"Account" component.

🗞️ Context

EAS MVP

🏗️ TO-DO (tasks or sub-issues)

• [ ] Add top level full width header component.
• [ ] Add a child "Account "component.
• [ ] Test on multiple chains. (Sepolia, Sepolia-arb as a priority).

✅ Acceptance criteria

• [ ] Header appears on all views.
• [ ] User's wallet connects on multiple wallets (metamask as a priority) and multiple chains (Sepolia, Sepolia-arb)

📷 Screenshots

📓 Notes