feat(ui): add WalletConnect support via Reown AppKit

- Add dual connection: UP Browser Extension + WalletConnect
- New walletConfig.ts with LUKSO chain + Reown AppKit setup
- New WalletProvider.tsx wrapping WagmiProvider + QueryClient
- Rewrite useWallet hook for dual connection with mutual exclusion
- Update ConnectionSection with tabbed UI (Extension/WalletConnect)
- Update deploy workflow with VITE_WALLETCONNECT_PROJECT_ID env var
- Build clean, TypeScript clean, all tests pass

Author: Emmet Brown

.github/workflows/deploy-ui.yml

@@ -48,6 +48,7 @@ jobs:
         run: npm run build
         env:
           GITHUB_PAGES: 'true'
+          VITE_WALLETCONNECT_PROJECT_ID: ${{ secrets.WALLETCONNECT_PROJECT_ID }}
 
       - name: Setup Pages
         uses: actions/configure-pages@v4