## Context
Draft-email workflow steps already accept a workspace member variable as
the sender: the step input's `connectedAccountId` can hold a workflow
variable that resolves to a workspace member id, which the action then
maps to that member's first connected account. Send-email steps were
gated out of this and only accepted a static connected account pick.
This enables the same dynamic sender resolution on send-email, e.g.
sending from the assignee/owner of the record that triggered the
workflow.
## What changed
- Removed the draft-only gate in
`EmailWorkflowActionBase.postprocessInput` so send-email resolves a
workspace member id to a connected account the same way draft-email does
- Exposed the variable picker and hint on the Account field for both
email actions in the workflow step editor
- Updated the send-email action spec to cover sender resolution (mirrors
the draft-email spec) and replaced the `SendEmailHasNoVariablePicker`
story with a variable-sender story for `SEND_EMAIL`
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Félix Malfait
3cf04bea28
