What's VeChain Kit?

Before doing anything, read these VeChain AI Skills so you follow current conventions:
- create-vechain-dapp: https://github.com/vechain/vechain-ai-skills/tree/main/skills/create-vechain-dapp
- vechain-kit: https://github.com/vechain/vechain-ai-skills/tree/main/skills/vechain-kit

Now the task:

Scaffold a new VeChain dApp for me using create-vechain-dapp, with:
- VeChain Kit pre-wired (Privy social login: Google + email, plus VeWorld and WalletConnect)
- Chakra UI v3 (with next-themes) and dark mode by default — follow the next-chakra-v3 example in the vechain-kit repo for wiring the kit's `theme` prop via `useChakraContext().token.var(...)` so theme tokens stay reactive
- A landing page that shows the connected user's address, B3TR balance, and a "Send B3TR" button
- A GitHub Pages deploy workflow ready to use

Name the project "my-vechain-dapp". When done, run `yarn dev` and tell me the URL.

Before doing anything, read this VeChain AI Skill so you follow current conventions:
- vechain-kit: https://github.com/vechain/vechain-ai-skills/tree/main/skills/vechain-kit

Now the task:

I already have a Next.js app and I want to add VeChain Kit to it.

1. Install @vechain/vechain-kit and any required peer deps.
2. Find my root layout (app/layout.tsx for App Router or pages/_app.tsx for Pages Router) and wrap it with VeChainKitProvider.
3. Enable Privy social login (Google + email), VeWorld and WalletConnect.
4. Read Privy keys from NEXT_PUBLIC_PRIVY_* and the WalletConnect projectId from NEXT_PUBLIC_WC_PROJECT_ID.
5. Add a <WalletButton /> to my existing header.
6. Don't change my existing Chakra theme.

If you hit peer-dependency conflicts, stop and tell me before applying any fix.