Feature: Canary test transaction

[BretasArthur1]

Problem

When sending from the multisig vault, I ( and I think many users ) usually do a test transaction first (e.g. 1 USDC) to verify the destination wallets. Today this costs two full proposal and approving ceremonies.

Proposal

Create a single flow where both transfers are approved once and executed strictly in order, with a HITL approval between them.

I've checked the SDK APIs the frontend consumes and the Batch primitive already supports this, what's missing is a helper that sets the flow up (batch + draft proposal + the two transactions + activate).

[BretasArthur1]

If this feature makes sense, I’m willing to implement it. Coordinating a PR creating the helper here and another one in the front repo adding the UI features.