[FE]Implement Wallet Connection Modal Component

[Iwueseiter]

Problem

The wallet connection context has openConnectModal() and closeConnectModal() functions, but the actual modal component is missing. Users can't connect their wallets through the intended UI flow.

📋 Current State

• Wallet context provider exists (wallet-connect-context.tsx)
• Connect button component exists (connect-button.tsx)
• Missing: Main wallet connection modal component

🎨 Requirements

Create WalletConnectModal.WalletConnectModal.tsx Opens wWalletConnectModal.tsx) is called from context

• Displays available wallet options (Argent, Braavos, etc.)
• Handles connection flow with loading/error states
• Matches app's dark theme design
• Integrates with existing `@starknet-reacWalletConnectModal.tsxmplementation

Acceptance Criteria

• Modal opens/closes via context functions
• Shows available wallet connectors
• Handles connection errors gracefully
• Matches existing modal design (dark theme)
• Integrates with useWallet() hook

[martinvibes]

@Iwueseiter kindly assign :)