Problem

When a Broker Update notification appears, the card shows the load context (status, load ID, driver, pickup/delivery) but nothing about which email account the update will be sent from. Clicking "Approve & Send" fires the message blind — the user has no way to confirm the sending identity before the broker receives it.

This matters because:

Carriers often have multiple connected mailboxes (dispatch@, updates@, personal user accounts, or a shared team inbox). Sending from the wrong one confuses brokers and can break their reply threading.

If a mailbox was disconnected or re-authenticated, the user can't tell from the notification whether the send will actually go through or from where.

There's no way to catch a misconfiguration until after the broker has already received it — sends are not reversible.

Proposed solution

Add a "From" line to the Broker Update notification card, above the Approve & Send button, e.g.:

From: dispatch@carrierdomain.com

Ideally alongside the existing "Also send to Telegram / Connected" row, so all delivery channels for the update are visible in one place.

Nice-to-haves (secondary)

If multiple mailboxes are connected, make the From field a dropdown so the user can switch sender at approval time rather than in settings.

Surface a warning state on the card if the connected mailbox has an auth/token error, instead of failing silently after approval.

Acceptance criteria

Sender email address is visible on the Broker Update card before the user clicks Approve & Send.

The displayed address matches the account actually used for the send.

Applies to the Preview view as well.