Tasks A3 + A6. Wizard rewritten as header + lines architecture:
- Header carries customer/addresses/PO/deadlines/invoicing/notes.
- One SO line created per fp.direct.order.line, carrying part,
coating, treatments M2M, qty, price, per-line deadline, rush flag,
and description.
- action_create_order loops wizard lines, invokes revision-bump
helper, and builds order_line tuples with x_fc_* fields.
- Form view uses notebook (Lines tab with editable tree + drill-in
form, Notes tab), amber missing-info banner at top, running totals
at bottom. Customer deadline maps to Odoo commitment_date on SO.
Single-line fields and their computes/onchanges removed from wizard;
moved to fp.direct.order.line in task A4.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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