Propagate catalog price to inventory and quote at current price

Quotes now reflect the current catalog price instead of a tenant's stale
typed-in cost, without disturbing accounting.

- InventoryItem gains CatalogReferencePrice + CatalogPriceUpdatedAt: the
  QUOTING price (current replacement cost), kept separate from UnitCost/
  AverageCost (the cost basis that drives valuation/COGS).
- The catalog sync (PowderCatalogUpsertService.PropagateToLinkedInventoryAsync,
  run at the end of every upsert) refreshes linked inventory items with the
  catalog's current price and product data (description, cure, SDS/TDS, color
  families, coverage, SG, transfer eff, requires-clear-coat). It NEVER touches
  cost, quantity, notes, image, location, or stock levels, and never nulls a
  tenant value with a catalog null. EF persists only actual changes.
- CatalogReferencePrice is also set at link time (catalog receive, incoming-
  from-catalog, identity match on create) so a freshly added powder quotes at
  the current price immediately.
- Pricing now uses CatalogReferencePrice ?? UnitCost: the quote/job powder
  pickers and PricingCalculationService (in-stock usage and powder-to-order
  billing). Falls back to UnitCost for non-catalog/manual powders, so nothing
  regresses. One current price for the whole quantity — no on-hand/to-order
  split. Per-coat snapshot still locks the price at quote creation.

Tests: propagation updates reference price + specs but not cost/qty/notes/
image, and skips a $0 catalog price. Full suite 276 green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/DashboardController.cs

@@ -850,6 +850,13 @@ public class DashboardController : Controller
             item.UnitCost = catalog.UnitPrice;
             item.LastPurchasePrice = catalog.UnitPrice;
         }
+
+        // Quoting reference price (current catalog list price) — separate from cost basis above.
+        if (catalog.UnitPrice > 0)
+        {
+            item.CatalogReferencePrice = catalog.UnitPrice;
+            item.CatalogPriceUpdatedAt = DateTime.UtcNow;
+        }
     }
 
     /// <summary>

src/PowderCoating.Web/Controllers/InventoryController.cs

@@ -314,10 +314,18 @@ public class InventoryController : Controller
             }
 
             // Link to the platform catalog row when this item's identity matches one, so the detail
-            // screen can show manufacturer-level status (discontinued / cannot reorder).
+            // screen can show manufacturer-level status (discontinued / cannot reorder) and quotes
+            // can use the current catalog price.
             var catalogMatch = await FindCatalogMatchAsync(item.Manufacturer, item.ManufacturerPartNumber);
             if (catalogMatch != null)
+            {
                 item.PowderCatalogItemId = catalogMatch.Id;
+                if (catalogMatch.UnitPrice > 0)
+                {
+                    item.CatalogReferencePrice = catalogMatch.UnitPrice;
+                    item.CatalogPriceUpdatedAt = DateTime.UtcNow;
+                }
+            }
 
             await _unitOfWork.InventoryItems.AddAsync(item);
             await _unitOfWork.SaveChangesAsync();
@@ -1308,6 +1316,8 @@ public class InventoryController : Controller
                 UnitCost              = catalogItem.UnitPrice,
                 AverageCost           = catalogItem.UnitPrice,
                 LastPurchasePrice     = catalogItem.UnitPrice,
+                CatalogReferencePrice = catalogItem.UnitPrice > 0 ? catalogItem.UnitPrice : (decimal?)null,
+                CatalogPriceUpdatedAt = catalogItem.UnitPrice > 0 ? DateTime.UtcNow : (DateTime?)null,
                 QuantityOnHand        = 0,
                 UnitOfMeasure         = "lbs",
                 InventoryCategoryId   = coatingCategory.Id,
@@ -1333,7 +1343,7 @@ public class InventoryController : Controller
                 efficiency   = item.TransferEfficiency ?? 65m,
                 unitOfMeasure= item.UnitOfMeasure,
                 categoryName = coatingCategory.DisplayName,
-                costPerLb    = item.UnitCost,
+                costPerLb    = item.CatalogReferencePrice ?? item.UnitCost,
                 colorName    = item.ColorName ?? item.Name,
                 colorCode    = "",
                 isIncoming   = true

src/PowderCoating.Web/Controllers/JobsController.cs

@@ -3492,7 +3492,8 @@ public class JobsController : Controller
                 efficiency = i.TransferEfficiency ?? 65m,
                 unitOfMeasure = i.UnitOfMeasure ?? "lbs",
                 categoryName = i.InventoryCategory!.DisplayName,
-                costPerLb = i.UnitCost,
+                // Quote at the current catalog price when linked; fall back to their cost otherwise.
+                costPerLb = i.CatalogReferencePrice ?? i.UnitCost,
                 colorName = i.ColorName ?? i.Name,
                 colorCode = i.ColorCode ?? "",
                 isIncoming = i.IsIncoming

src/PowderCoating.Web/Controllers/QuotesController.cs

@@ -2545,7 +2545,8 @@ public class QuotesController : Controller
                 efficiency = i.TransferEfficiency ?? 65m,
                 unitOfMeasure = i.UnitOfMeasure ?? "lbs",
                 categoryName = i.InventoryCategory!.DisplayName,
-                costPerLb = i.UnitCost,
+                // Quote at the current catalog price when linked; fall back to their cost otherwise.
+                costPerLb = i.CatalogReferencePrice ?? i.UnitCost,
                 colorName = i.ColorName ?? i.Name,
                 colorCode = i.ColorCode ?? "",
                 isIncoming = i.IsIncoming