feat(configurator): C6 - Express Orders form view + menu (v1, stock widgets)

Spreadsheet-style flat entry view on the existing fp.direct.order.wizard
model. Renders:
- Customer + Shipping prominent (row 1)
- PO block (PO# + attachment + Pending toggle + Expected date)
- Scheduling/Lead Time + Pricing/Pricelist (row 2)
- Order Lines spreadsheet with: Part #, Specification, Line Job #,
  Thickness, Mask toggle, Bake text, Internal Notes, Serials, Qty,
  Price, Subtotal, Process/Recipe (optional-show)
- Notes + Terms split (internal vs customer-facing)
- View-switch buttons to bounce between Express and Legacy on a draft

New menu: Plating > Sales > '+ New Express Order' (sequence 3).
Same DB rows as legacy view (view_source='express' for routing).

v1 deferments: OWL FpExpressPartCell (multi-row part cell), OWL
FpExpressBakePill (click-to-edit), DWG/OPEN/+bulk inline buttons,
custom SCSS, quick-create part view, pricelist display_name override.
These come in later iterations.

fusion_plating/fusion_plating_configurator/wizard/fp_direct_order_wizard.py

@@ -164,6 +164,35 @@ class FpDirectOrderWizard(models.Model):
     def _fp_default_pricelist(self):
         """Default pricelist = company's default. Re-resolved on partner pick."""
         return self.env.company.partner_id.property_product_pricelist.id or False
+
+    # ---- View switching (Express ↔ Legacy) ----
+    def action_switch_to_express(self):
+        """Re-open this draft in the Express view."""
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.act_window',
+            'res_model': 'fp.direct.order.wizard',
+            'res_id': self.id,
+            'view_mode': 'form',
+            'view_id': self.env.ref(
+                'fusion_plating_configurator.view_fp_express_order_form'
+            ).id,
+            'target': 'current',
+        }
+
+    def action_switch_to_legacy(self):
+        """Re-open this draft in the Legacy direct-order view."""
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.act_window',
+            'res_model': 'fp.direct.order.wizard',
+            'res_id': self.id,
+            'view_mode': 'form',
+            'view_id': self.env.ref(
+                'fusion_plating_configurator.view_fp_direct_order_wizard_form'
+            ).id,
+            'target': 'current',
+        }
     invoice_strategy = fields.Selection(
         [('deposit', 'Deposit'), ('progress', 'Progress Billing'),
          ('net_terms', 'Net Terms'), ('cod_prepay', 'COD / Prepay')],