Make GridView non-editable in frmMain

Set gridView.OptionsBehavior.Editable to False after best-fitting columns, ensuring users cannot edit cell values directly in the UI.

App/EmailProfiler.Form/frmMain.vb

@@ -1069,6 +1069,7 @@ Public Class frmMain
             If gridView IsNot Nothing Then
                 gridView.OptionsView.ColumnAutoWidth = True
                 gridView.BestFitColumns()
+                gridView.OptionsBehavior.Editable = False
             End If
 
         Catch ex As Exception