Fix two production billing bugs: invoice missing oven cost, quote stuck in Draft after send

Bug 1 — Invoice total didn't match job total for direct jobs:
- Root cause: all three item-save paths in JobsController passed null for
  ovenCostId, so FinalPrice/ShopSuppliesAmount were stored without oven cost
  while the Details page recalculated live with OvenCostId and showed higher.
- Add OvenBatchCost stored field to Job entity (migration AddJobOvenBatchCost,
  default 0 for existing rows).
- Fix Create, Edit, and UpdateItems to pass job.OvenCostId and save OvenBatchCost.
- Fix InvoicesController.Create GET for direct jobs to use stored OvenBatchCost
  and ShopSuppliesAmount as separate labeled lines instead of recalculating
  shop supplies from scratch (which excluded the oven cost base).

Bug 2 — Quote status stayed Draft after "Send Quote via Email":
- ResendQuote advanced the approval token and sent the email but never
  updated the status. Added Draft → Sent advancement (same guard used by
  the SMS send path) so the status updates on successful email send.

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

src/PowderCoating.Web/Controllers/JobsController.cs

@@ -1170,9 +1170,10 @@ public class JobsController : Controller
                 var totals = await _pricingService.CalculateQuoteTotalsAsync(
                     dto.JobItems, companyId, dto.CustomerId,
                     createCosts?.TaxPercent ?? 0m,
-                    dto.DiscountType, dto.DiscountValue, dto.IsRushJob, null, 1, null);
+                    dto.DiscountType, dto.DiscountValue, dto.IsRushJob, job.OvenCostId, 1, null);
 
                 job.FinalPrice             = totals.Total;
+                job.OvenBatchCost          = totals.OvenBatchCost;
                 job.ShopSuppliesAmount     = totals.ShopSuppliesAmount;
                 job.ShopSuppliesPercent    = totals.ShopSuppliesPercent;
                 job.UpdatedAt  = DateTime.UtcNow;
@@ -1628,8 +1629,9 @@ public class JobsController : Controller
                 var totals = await _pricingService.CalculateQuoteTotalsAsync(
                     dto.JobItems, companyId, dto.CustomerId,
                     editCosts?.TaxPercent ?? 0m,
-                    dto.DiscountType, dto.DiscountValue, dto.IsRushJob, null, 1, null);
+                    dto.DiscountType, dto.DiscountValue, dto.IsRushJob, job.OvenCostId, 1, null);
                 job.FinalPrice          = totals.Total;
+                job.OvenBatchCost       = totals.OvenBatchCost;
                 job.ShopSuppliesAmount  = totals.ShopSuppliesAmount;
                 job.ShopSuppliesPercent = totals.ShopSuppliesPercent;
             }
@@ -3038,9 +3040,10 @@ public class JobsController : Controller
             // Calculate full total (overhead, margins, tax) to match what the wizard displays
             var totals = await _pricingService.CalculateQuoteTotalsAsync(
                 model.JobItems, currentUser.CompanyId, job.CustomerId,
-                model.TaxPercent, "None", 0, false, null, 1, null);
+                model.TaxPercent, "None", 0, false, job.OvenCostId, 1, null);
 
             job.FinalPrice          = totals.Total;
+            job.OvenBatchCost       = totals.OvenBatchCost;
             job.ShopSuppliesAmount  = totals.ShopSuppliesAmount;
             job.ShopSuppliesPercent = totals.ShopSuppliesPercent;
             job.UpdatedAt  = DateTime.UtcNow;