Import wallets UI improvements

When importing a new wallet from seed phrase, display the current word count entered into the text box just below the little picker for suggested words, making it easier to keep track of whether the full 12 or 24 words have been entered.

Also, when scanning addresses, show some kind of indicator like "Transaction history/funds found on 3 UTXOs!" or something that counts up with the scanning amount, so that you know you got the wallet right and it's not scanning some empty wallet with a similar seed phrase.