💰 Replace mock wallet address with real Web3 integration

[Smartdevs17]

Problem

The app uses hardcoded mock addresses instead of connecting to real wallets, making it unusable for actual payments.

Context

Users cannot connect their real wallets (MetaMask, WalletConnect) - all addresses are hardcoded placeholders.

Proposed Solution

Implement real wallet connection:

1. Integrate WalletConnect properly with actual session management
2. Replace mock addresses with real connected wallet addresses
3. Implement proper disconnect functionality
4. Handle wallet change events

Acceptance Criteria

• User can connect MetaMask/WalletConnect wallet
• Connected address displayed correctly
• Wallet disconnect works properly
• Reconnection persists across app restarts
• Network change detection works

Technical Notes

Files:

• src/screens/WalletConnectScreen.tsx:58-68
• src/services/walletService.ts:20-35
• src/store/walletStore.ts

Components: WalletConnectScreen, walletService, walletStore

Constraints

• Must support iOS and Android
• Handle MetaMask not installed scenario
• Timeout handling for connection failures

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[devdianax]

@devdianax has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

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