Feat/wallet

[ummarig]

Changes Made:

1. Created new WalletAccountMenu.tsx - A comprehensive, accessible dropdown menu component that:

   • Shows connected/disconnected state
   • Displays shortened public key and current network (testnet/mainnet)
   • Includes connect, disconnect, and error state handling
   • Supports full keyboard navigation and screen reader accessibility
   • Clicks outside to close, ESC key to close, and proper focus management
   • Responsive design that works on all screen sizes

2. Updated layout.tsx - Replaced the old WalletButton with the new WalletAccountMenu, ensuring the wallet connection state is visible on every page.

Key Features Implemented:

• Consistent state across all pages: The header now shows wallet status everywhere
• Shortened public key: Displays GABC…WXYZ format while showing full key on hover
• Network indicator: Shows which network (testnet/mainnet) the wallet is connected to
• Connect/Disconnect actions: Proper UI for both states with loading states
• Error handling: Maintains all existing error states with proper accessibility roles
• Keyboard accessible: Full support for keyboard navigation (Enter, Space, Arrow keys, ESC, Tab)
• No sensitive data: Never displays private keys or transaction secrets
• Responsive design: Works on mobile and desktop with proper Tailwind styling

The implementation maintains compatibility with all existing functionality while providing a much improved user experience for wallet connection management.

closes #80