Task B4. New fp.add.from.so.wizard transient model: given the current
direct-order wizard + customer, lists the customer's prior confirmed
sale orders, lets the estimator tick source lines, and clones them
into fp.direct.order.line rows (part, coating, treatments, qty,
price, deadline, rush, WO group, description).
Button "+ Add From Prior SO" lives on the Lines tab of the main
wizard, visible once the customer is picked. Sub-wizard rejects
source lines that predate the new plating fields (no x_fc_part_catalog_id).
Smoke-tested on odoo-entech: copying all 3 lines of S00066 onto a
fresh wizard reproduces part/coating/qty/price correctly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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