fix: 修复EA刀叠板查表直径区间匹配，叠板区改为折叠输入即算

EA刀/短槽刀列按参数表下限区间 [0.60,0.65)/[0.65,0.70)/[0.70,0.75)/>=0.75 匹配，修复 0.706mm 等刀径查表失败；叠板计算改为 Expander 默认收折、移除计算按钮、输入变化自动计算。

Co-authored-by: Cursor <cursoragent@cursor.com>

StartupSelectionWindow.xaml.cs

@@ -56,16 +56,5 @@ namespace DrillTools
             SelectedAction = StartupAction.ScaleDrillTape;
             Close();
         }
-
-        /// <summary>
-        /// 计算叠板按钮点击事件
-        /// </summary>
-        private void CalculateStackCount_Click(object sender, RoutedEventArgs e)
-        {
-            if (DataContext is StartupSelectionViewModel vm)
-            {
-                vm.CalculateStackCount();
-            }
-        }
     }
 }