Improve StarsPerRepository selection and ordering

The StarsPerRepository property now filters out repositories with null or empty names, orders the remaining repositories by stargazer count in descending order, and then takes the top 10 to convert into a dictionary. This ensures a more accurate representation of the top repositories by stargazer count.

GPVBlazor/GPVBlazor/Models/StatModel.cs

@@ -66,7 +66,9 @@ public class RepositoryStats
             .ToDictionary(group => group.Key!, group => group.Count());
 
         public Dictionary<string, int> StarsPerRepository => _repositories
-            .Take(10)
-            .ToDictionary(repo => repo.Name!, repo => repo.StargazersCount);
+           .Where(repo => !string.IsNullOrEmpty(repo.Name))
+           .OrderByDescending(repo => repo.StargazersCount)
+           .Take(10)
+           .ToDictionary(repo => repo.Name!, repo => repo.StargazersCount);
     }
 }