When attempting to construct an unsigned L-BTC transaction, "transaction editor: text" cannot be used

Tangentially related to this perhaps:
https://github.com/cryptoadvance/specter-desktop/issues/1439

paste output into specter create transaction tab ("transaction editor: text") within a liquid hot wallet and press "create unsigned transaction button"

Receive error message:

```Bitcoin Core RpcError: Request error: asset must be of length 64 (not 3, for 'btc')```
changing "unit" to "sat" results in a different, but similar error message:

```Bitcoin Core RpcError: Request error: asset must be of length 64 (not 3, for 'sat')```

It works as intended with the "transaction editor: UI" as opposed to text.

Testing single address tx with "transaction editor: text"

same error as above.


Reproduce the failure in a Liquid hot wallet using the transaction editor: text and the create unsigned transaction button, then compare it with the working transaction editor: UI path. Trace how the text input maps the asset and unit fields before the Bitcoin Core request. Done means valid text-editor input creates an unsigned L-BTC transaction without the asset-length error.

Written by the indexing model from the issue text.