Fix QuoteApprovalControllerTests build break after Phase 3 migration

QuoteApprovalController's constructor changed from ApplicationDbContext to
IUnitOfWork in Phase 3, but the test helper was still passing the raw context.
Wrap context in UnitOfWork in CreateController; tests seed/assert through
context directly so the same instance works correctly.

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

tests/PowderCoating.UnitTests/QuoteApprovalControllerTests.cs

@@ -10,6 +10,7 @@ using PowderCoating.Application.Interfaces;
 using PowderCoating.Core.Entities;
 using PowderCoating.Core.Enums;
 using PowderCoating.Infrastructure.Data;
+using PowderCoating.Infrastructure.Repositories;
 using PowderCoating.Web.Controllers;
 using PowderCoating.Web.Hubs;
 using PowderCoating.Web.ViewModels;
@@ -319,7 +320,7 @@ public class QuoteApprovalControllerTests
         hubContext.SetupGet(x => x.Clients).Returns(hubClients.Object);
 
         var controller = new QuoteApprovalController(
-            context,
+            new UnitOfWork(context),
             notifications.Object,
             inApp.Object,
             Mock.Of<IStripeConnectService>(),