Approval now snapshots the rate estimate and generates a last-mile
contract instead of invoicing immediately. The customer picks a delivery
date on the confirm form, then reviews and signs the contract in the
portal (saved signature or drawn); the signed PDF is stored as
LM_<CustomerName>.pdf and only then is the advance invoice issued.
Backoffice shows signature status and the contract download.
Enable per-truck editing of warehouse gate arrival/departure times
(arrivedAt/departedAt) via modal on Import Trucks page. Accessible via
row action menu for EDR-haulage trucks. Includes backend endpoint
POST /last-mile/:id/warehouse-gate-times and frontend modal with
DateTimePicker inputs.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>