Form sections: order info, quotation reference (PI No/Date), requisition (No/Date),
place of delivery, line items (UoM dropdown, size, GST% per item), vendor, T&C, attachments.
Line items editor: add/remove rows, GST dropdown (0/5/12/18/28%, default 18%),
live taxable/GST/grand-total breakdown.
T&C: fixed line 1, individual inputs for Delivery, Dispatch, Inspection,
Transit Insurance, Payment Terms, Others.
Save as draft or submit directly for approval (→ MGR_REVIEW).
Submitter: open PO count, recent orders table, New PO CTA.
Manager: approvals count, approved PO listing, spend by vessel and month bar charts (Recharts).
Accounts: payment queue total value, ready-for-payment count.
Admin/Auditor: total PO count card.
Sign API returns presigned upload URL + storage key.
Dev: files served through auth-gated /api/files/dev route with path-traversal protection.
Prod: R2 presigned URLs for upload and time-limited download.
7 event templates: po-submitted, po-approved, po-rejected, edits-requested,
vendor-id-needed, payment-processed, receipt-confirmed.
Notifier uses Resend in production and console.log in development.
10 statuses, 11 transitions. Each transition declares allowedRoles,
requiresNote flag and sideEffects (which email groups to notify).
Helpers: getTransition, canPerformAction, getAvailableActions, requiresNote.
