test(gift): add SeedTutorialPresentsAsync helper

SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs

@@ -562,6 +562,36 @@ internal sealed class SVSimTestFactory : WebApplicationFactory<Program>
         await db.SaveChangesAsync();
     }
 
+    /// <summary>
+    /// Seed the five tutorial ViewerPresent rows for a test viewer. RegisterViewer (admin/social
+    /// path) does NOT auto-seed; only the production /tool/signup -> RegisterAnonymousViewer flow
+    /// does. Tests opt in by calling this helper after SeedViewerAsync when they want a tutorial-
+    /// shaped inbox state.
+    /// </summary>
+    public async Task SeedTutorialPresentsAsync(long viewerId)
+    {
+        using var scope = Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var createdAt = DateTime.UtcNow;
+        foreach (var spec in SVSim.Database.SeedData.TutorialPresents.All)
+        {
+            db.ViewerPresents.Add(new ViewerPresent
+            {
+                ViewerId       = viewerId,
+                PresentId      = spec.PresentId,
+                Status         = PresentStatus.Unclaimed,
+                RewardType     = spec.RewardType,
+                RewardDetailId = spec.RewardDetailId,
+                RewardCount    = spec.RewardCount,
+                ItemType       = spec.ItemType,
+                Message        = spec.Message,
+                CreatedAt      = createdAt,
+                Source         = "tutorial",
+            });
+        }
+        await db.SaveChangesAsync();
+    }
+
     /// <summary>
     /// Reads the viewer's current owned count for <paramref name="itemId"/>. Returns 0 if no
     /// row exists. Tests use this to assert ticket consumption after /tutorial/pack_open.