Now resets and kicks user back to chunk selection if the chunk has been learnt

LearningChineseFixed/Pages/Learn.razor

@@ -125,7 +125,11 @@
 
     void GenerateQuestion()
     {
-        if (DontSkipTheseCChar.Count < 5) throw new Exception("Finished this chunk of CChars");
+        if (DontSkipTheseCChar.Count < 5) 
+        {
+            FinishAndKickBackToLearn();
+            return;
+        }
 
         int correctIndex = Random.Shared.Next(0, Answers.Length);
 
@@ -142,6 +146,19 @@
         }
     }
 
+    void FinishAndKickBackToLearn()
+    {
+        Snackbar.Add("Congrats, you have compleated this chunk!", Severity.Success, config => 
+        { 
+            config.RequireInteraction = true;
+            config.CloseAfterNavigation = false;
+        });
+        Program.UpdateUiEvent -= OnUiUpdate;
+        Program.CCharsLeft = 0;
+
+        navigator.NavigateTo("");
+    }
+
     async void Submit()
     {
         bool isCorrect = Answers.Any(x => x.isCorrect && x.isSelected);