use wallet connector provider

[albert-mr]

Problem

Wallet connection doesn't work on mobile browsers. The current EIP-6963 implementation is for desktop browser extensions only.

Requirements

• Support MetaMask Mobile in-app browser
• Support Trust Wallet Mobile in-app browser
• Detect mobile environment and use appropriate provider detection
• Ensure modal works on mobile screens

Context

Desktop wallet selection was added in PR #120. Mobile wallets inject providers differently and need specific handling.

[albert-mr]

check if it makes sense to add a wallet provider instead of custom implementation, check if there is a sandbox no user version of such provider

[hakan6207]

good