[GA4/Event] Add wallet_connect tracking for developer portal

[cshein45]

Summary

Add GA4 wallet_connect event to track when users connect their wallets on the Movement Network developer portal.

Steps to Reproduce

1. Go to: https://www.movementnetwork.xyz/developer
2. Click the "Connect Wallet" button
3. Observe that no GA4 event is fired

Expected Behavior

• A GA4 event wallet_connect should be sent
• Event parameters:
  • user_address (wallet address)
  • wallet_type (MetaMask, WalletConnect, etc.)

Actual Behavior

• No GA4 event is currently sent

Suggested Solution

• Implement GA4 event call on wallet connection:

gtag('event', 'wallet_connect', {
  user_address: '0x123...',
  wallet_type: 'MetaMask'
});

[Movement Network Comprehensive Overview 27134bf7239f8075a2b2c2164c572962.md](https://github.com/user-attachments/files/24413352/Movement.Network.Comprehensive.Overview.27134bf7239f8075a2b2c2164c572962.md)
[Safari.pdf](https://github.com/user-attachments/files/24413353/Safari.pdf)