Fix NoExtraLayerCharge not persisting on quotes and job EditItems reload

- QuotePricingAssemblyService.BuildQuoteItemCoat: map NoExtraLayerCharge from
  CreateQuoteItemCoatDto to QuoteItemCoat on every quote save (was always omitted)
- JobsController.EditItems GET: include NoExtraLayerCharge in coat mapping when
  reloading existing items for the wizard (was dropped, causing revert on second edit)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Application/Services/QuotePricingAssemblyService.cs

@@ -264,6 +264,7 @@ public class QuotePricingAssemblyService : IQuotePricingAssemblyService
             TransferEfficiency = coatDto.TransferEfficiency,
             PowderCostPerLb = coatDto.PowderCostPerLb,
             PowderToOrder = coatDto.PowderToOrder,
+            NoExtraLayerCharge = coatDto.NoExtraLayerCharge,
             Notes = coatDto.Notes,
             CompanyId = companyId,
             CreatedAt = createdAtUtc

src/PowderCoating.Web/Controllers/JobsController.cs

@@ -2946,6 +2946,7 @@ public class JobsController : Controller
                 TransferEfficiency = c.TransferEfficiency,
                 PowderCostPerLb    = c.PowderCostPerLb,
                 PowderToOrder      = c.PowderToOrder,
+                NoExtraLayerCharge = c.NoExtraLayerCharge,
                 Notes              = c.Notes
             }).ToList(),
             PrepServices = ji.PrepServices.Select(ps => new CreateQuoteItemPrepServiceDto