Add Pre-Signature Dialog for EVM/SVM Connection

[helciofranco]

Currently, we are automatically requesting a signature from the user when connecting a EVM/SVM wallet.
Improve the flow by adding a pre-signature dialog that informs the user about the purpose of the signature.

The dialog should display a message like: “Sign this message to prove you own this wallet and proceed. Canceling will disconnect you.”

If the user cancels, the wallet should disconnect. This update improves the user experience and minimizes the risk of race conditions during wallet requests.

[helciofranco]

#360
We can revert this Arthur’s PR if we add the pre-dialog modal. No timeout will be needed anymore.