This PR adds the possibility to request access to a user’s account in the ledger live app. To do this, we need to extend the permissions in the manifest file - account.request. When the user has selected an account, let's save it in a special context for global access.

What has been done

• Create an environment variable to switch the test network to the regular one - VITE_USE_TESTNET
• Create a context for an account to have global access to it.
• Change the style for a button - Styles are still not perfect but let's correct that in a separate task.
• Update global styles
• Add functions to format the token amount

UI