Fix SQLite crash: don't ORDER BY DateTimeOffset

SQLite can't translate ORDER BY on DateTimeOffset columns, so loading the
wishlists/invites pages threw NotSupportedException. Order by the autoincrement
Id (same newest-first result) instead. Add a regression test that exercises the
owned/shared list queries against SQLite.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/WishNinja/Components/Pages/Admin/Invites.razor

@@ -102,7 +102,7 @@ else
         await using var db = await DbFactory.CreateDbContextAsync();
         pending = await db.Invites
             .Where(i => i.AcceptedAt == null)
-            .OrderByDescending(i => i.CreatedAt)
+            .OrderByDescending(i => i.Id) // Id grows with creation; SQLite can't ORDER BY DateTimeOffset
             .ToListAsync();
     }
 

src/WishNinja/Components/Pages/Wishlists.razor

@@ -79,7 +79,7 @@ else
         owned = await db.Wishlists
             .Include(w => w.Items)
             .Where(w => w.OwnerId == userId)
-            .OrderByDescending(w => w.CreatedAt)
+            .OrderByDescending(w => w.Id) // Id grows with creation; SQLite can't ORDER BY DateTimeOffset
             .ToListAsync();
     }
 

src/WishNinja/Services/WishlistService.cs

@@ -21,7 +21,7 @@ public class WishlistService(IDbContextFactory<ApplicationDbContext> dbFactory)
         await using var db = await dbFactory.CreateDbContextAsync();
         return await db.Wishlists
             .Where(w => w.OwnerId == userId)
-            .OrderByDescending(w => w.CreatedAt)
+            .OrderByDescending(w => w.Id) // Id grows with creation; SQLite can't ORDER BY DateTimeOffset
             .ToListAsync();
     }
 

tests/WishNinja.Tests/WishlistServiceTests.cs

@@ -144,5 +144,17 @@ public class WishlistServiceTests : IDisposable
         Assert.NotNull(await _svc.GetDetailAsync(1, OwnerId));    // owner always
     }
 
+    [Fact]
+    public async Task Owned_and_shared_list_queries_run_on_sqlite()
+    {
+        // Regression: these order by a timestamp; SQLite can't ORDER BY DateTimeOffset, so the
+        // service must order by a supported column. This would throw NotSupportedException otherwise.
+        var owned = await _svc.GetOwnedAsync(OwnerId);
+        Assert.Single(owned);
+
+        var shared = await _svc.GetSharedWithAsync(FriendId);
+        Assert.Single(shared); // the AllMembers list is visible to other members
+    }
+
     public void Dispose() => _db.Dispose();
 }