Fix unit test build failures after logo service and pricing changes

DepositsController and GiftCertificatesController gained a required
ICompanyLogoService constructor parameter in the PDF logo fix; their
test factories were not updated and failed to compile on Jenkins.
Added Mock.Of<ICompanyLogoService>() to both factory methods and the
missing using directive to DepositsControllerTests.

PricingCalculationService now only charges oven cost for items that
have explicit coating layers (Coats collection non-empty), because
sandblast/prep-only and labor items do not go in the oven. Two tests
that tested the old "all items count toward oven fraction" logic were
updated to include a single coat entry on each item, which restores
the expected oven fraction math without changing the tested behaviour.

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

tests/PowderCoating.UnitTests/GiftCertificatesControllerTests.cs

@@ -253,7 +253,8 @@ public class GiftCertificatesControllerTests
             Mock.Of<IMapper>(),
             Mock.Of<ILogger<GiftCertificatesController>>(),
             userManager.Object,
-            Mock.Of<IPdfService>());
+            Mock.Of<IPdfService>(),
+            Mock.Of<ICompanyLogoService>());
 
         controller.ControllerContext = new ControllerContext { HttpContext = httpContext };
         controller.TempData = new TempDataDictionary(httpContext, Mock.Of<ITempDataProvider>());