Tutorial 03 step 5: "Next step" doesn't unlock after send to Test Wallet

### Packages versions

N/A — web playground at playground.miden.xyz (Testnet), Chrome

### Bug description

In tutorial 03 ("Connect wallet and sign transactions"), step 5 of 6 asks to submit a send transaction to the recipient wallet.

What I did: connected Miden Wallet (public account), minted 100 MDN via the tutorial button, consumed the note, then submitted send transactions: 50 MDN to another account I own and 2x10 MDN to the imported Test Wallet (mtst1az7el72...yycr4h99). All transactions were confirmed — my account nonce increased to 3 and balances updated correctly.

Expected: the "Next step" button unlocks after the send transaction is confirmed.

Actual: "Next step" stays disabled, even after a page refresh.

Possibly related: after a page reload, the imported Test Wallet disappeared from the Accounts list and I had to re-import it manually.

### How can this be reproduced?

1. Open tutorial 03 "Connect wallet and sign transactions" on playground.miden.xyz (Testnet)
2. Connect a public Miden Wallet account, mint 100 MDN (step 2), consume the note (step 3)
3. On step 4, copy the Test Wallet address, import it via "Create new account" -> "Import account"
4. On step 5, create a "New send transaction": target = Test Wallet, asset = MDN, amount = 10, submit and sign
5. Wait for the tx to confirm (nonce increases, balance updates), refresh the page
6. "Next step" remains disabled

Note: reloading the page also removes the imported Test Wallet from the Accounts list.

### Relevant log output

```shell

```