feat: Integrate WalletKit / WalletConnect v2 with multi-wallet support

[arawrdn]

feat: Integrate WalletKit / WalletConnect v2 with multi-wallet support

Summary of changes:

1. WalletKit / WalletConnect v2 integration

   • Using PROJECT_ID=180a7164cfa9e5388daf1160841f65a0
   • Multi-wallet support: Metamask, Rainbow, Coinbase, Trust Wallet
   • QR modal & mobile deep link for mobile wallets

2. Session management

   • Automatic session restore on page reload
   • Event listeners for accountsChanged, chainChanged, disconnect, and session_expire

3. Chain / network management

   • Supports Mainnet, Optimism, and Base
   • Auto prompts user if the network/chain is incorrect

4. JS/TS Bridge & Elm Port

   • walletKit.ts helper for WalletKit / WalletConnect
   • walletBridge.ts for Elm bridge
   • Elm port WalletConnect.elm for connect/disconnect actions

5. UI updates

   • Added Connect/Disconnect buttons in modal:
     Connect Wallet (WalletKit)
     Disconnect

6. Documentation

   • Updated README with instructions for WalletKit / WalletConnect v2 setup
   • Explains multi-wallet support, session restore, chain management, and event listeners

Optional checklist for reviewers:

• Tested wallet connection on Mainnet, Optimism, and Base
• Verified session restore works on page reload
• Event listeners (accountsChanged, chainChanged, disconnect) work correctly
• UI buttons trigger the correct Elm ports
• README instructions are clear and accurate

[arawrdn]

Little update :) thank u