End-to-End Network Switch (Testnet ↔ Mainnet)

[Godbrand0]

Summary

This PR implements end-to-end network switch functionality to allow seamless switching between testnet and mainnet environments.

closes #158

Features

• NetworkSwitcher Component: UI component for switching between testnet and mainnet
• TestnetBanner Component: Visual indicator showing the current network environment
• NetworkProvider: Global state management for network configuration
• useNetwork Hook: Custom hook for accessing network state
• Contract Registry Service: Manages network-specific contract addresses
• Updated Wallet Provider: Handles network switching and reconnection
• Network-Aware Services: Updated fee estimation and transaction simulation services
• Settings Integration: Network configuration options in the settings page

Changes Made

• Added 5 new files for network switching functionality
• Modified 11 existing files to integrate network switching
• Total: 16 files changed, 465 insertions, 53 deletions

Testing

• Tested network switching between testnet and mainnet
• Verified wallet reconnection after network change
• Confirmed proper contract address resolution for each network
• Validated UI updates reflecting current network state

Screenshots

[Add screenshots of the network switcher in action]

Checklist

• Code follows project style guidelines
• Self-review of the code completed
• Code is tested locally
• Documentation updated if necessary

[Godbrand0]

can you take a look