Allow to impersonate wallets #61

User story / Problem statement

Currently, testing dApp behavior for a specific wallet address requires access to that wallet's private key. This makes it difficult to debug issues or test UI states tied to specific on-chain positions.

Expected outcome

Users can provide an arbitrary Ethereum address to "connect" as that wallet within the dApp, viewing the interface as if they were that address without needing the private key.

Acceptance criteria

• User can enter an arbitrary Ethereum address to impersonate
• The dApp renders as if the impersonated address is the connected wallet
• Read operations (balances, positions, etc.) reflect the impersonated address's on-chain state
• Impersonation mode is clearly indicated in the UI to avoid confusion with a real connection