Feature request: memo field and subaccount support in Send UI

[deucalioncodes]

Is your feature request related to a problem?

The Send dialog currently only has a "To" address field and amount. There is no way to specify:

1. A memo — needed for many dApps and services that use memos to identify deposits (e.g. exchanges, payment processors, canister-based services)
2. A subaccount — neither a source subaccount (for users who want to organize funds) nor a destination subaccount (for sending to ICRC-1 accounts with subaccounts)

This limits Oisy's usefulness for anything beyond simple peer-to-peer transfers.

Describe the solution you'd like

Add optional fields to the Send UI:

• Memo field (bytes or numeric) — passed through to the ledger transfer call
• Destination subaccount — the ICRC-1 textual representation already encodes subaccounts (principal + checksum + subaccount), but an explicit field would improve UX for users who receive a subaccount separately

These fields could be collapsed under an "Advanced" section to keep the default experience clean.

Additional context

• The ICRC-1 standard supports both memo and subaccount in transfers — this is about exposing them in the wallet UI
• Related: Multiple accounts in Oisy #2474 (multiple accounts / subaccount management)
• The NNS dapp already supports both memo and subaccount in its send flow

[sbpublic]

Hi Jose
Yes, I absolutely agree on both items, and thank you for the really nice description.
This seems to be an easy win, so let's see that we can schedule this in very soon.
Until end of March, we are 'booked', but should find the time to start very soon in April.

[sbpublic]

Just a quick update. We are close with the memo.

[deucalioncodes]

Thank you! When can we expect this to go live?
In addition to the memo, will subaccounts be supported as well?

[sbpublic]

It should make it in around end of June.
"separated" subaccount entry has not yet started (I could not find the place where the nns dapp is offering it), but I aim to get a spec ready this month.