feat: 基础信息叠板计算功能

- 新增 StackCountCalculator: 数字化规则表（短槽刀/EA刀10×4、槽刀10×4、钻针10×6），公开Calculate方法，输入校验，查表逻辑，16oz铜厚递减
- 新增 StartupSelectionViewModel: 替换匿名DataContext，保留所有显示属性，新增板厚/铜厚输入、计算结果/明细、CanCalculate
- 新增 NonEmptyToVisibilityConverter
- 修改 StartupSelectionWindow.xaml: 增宽680px，新增3行（输入+结果+明细），计算按钮在基础信息内部
- 修改 StartupSelectionWindow.xaml.cs: 构造函数接收ViewModel，新增计算按钮事件
- 修改 App.xaml.cs: 构建ViewModel实例，CalculateStackMinDiameters独立遍历Tools（含0.749mm，排除机台码）
- 修改 App.xaml: 注册NonEmptyToVisibilityConverter

App.xaml.cs

@@ -5,6 +5,7 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using System.Windows;
+using System.Collections.ObjectModel;
 
 namespace DrillTools
 {
@@ -60,20 +61,28 @@ namespace DrillTools
             double outer3175XSpacing = viewModel.Outer3175XSpacing;
             double outer3175YSpacing = viewModel.Outer3175YSpacing;
 
+            var selectionViewModel = new StartupSelectionViewModel
+            {
+                FileName = Path.GetFileNameWithoutExtension(filePath),
+                MinDrillDiameter = minDrill,
+                MinSlotDiameter = minSlot,
+                MinEADiameter = minEA,
+                IsPpDrillTape = isPpDrillTape,
+                PpXSpacing = ppXSpacing,
+                PpYSpacing = ppYSpacing,
+                HasOuter3175Spacing = hasOuter3175Spacing,
+                Outer3175XSpacing = outer3175XSpacing,
+                Outer3175YSpacing = outer3175YSpacing
+            };
+
+            // 叠板计算用的最小刀径独立遍历 Tools 计算，包含 0.749mm
+            CalculateStackMinDiameters(viewModel.Tools, selectionViewModel);
+
             var selectionWindow = new StartupSelectionWindow(
-                filePath,
+                selectionViewModel,
                 canClearParameters,
                 canGeneratePpDrillTape,
-                canScaleDrillTape,
-                minDrill,
-                minSlot,
-                minEA,
-                isPpDrillTape,
-                ppXSpacing,
-                ppYSpacing,
-                hasOuter3175Spacing,
-                outer3175XSpacing,
-                outer3175YSpacing);
+                canScaleDrillTape);
             selectionWindow.ShowDialog();
 
             switch (selectionWindow.SelectedAction)
@@ -290,5 +299,48 @@ namespace DrillTools
 
             return supportedExtensions.Contains(extension);
         }
+
+        /// <summary>
+        /// 从 MainWindowViewModel.Tools 独立遍历计算叠板用最小刀径
+        /// 分类逻辑与 UpdateMinDiameterInfo 一致，但不排除 0.749mm
+        /// 槽刀分类映射：Slot/DustSlot/DeburrSlot → 槽刀，EASlot/EASlot2 → EA刀，Drill → 钻针
+        /// </summary>
+        private static void CalculateStackMinDiameters(
+            ObservableCollection<ToolItem> tools,
+            StartupSelectionViewModel selectionViewModel)
+        {
+            double minDrill = 0;
+            double minSlot = 0;
+            double minEA = 0;
+
+            foreach (var tool in tools)
+            {
+                // 机台码刀具（ToolType.MachineCode）是固定孔位，不参与叠板计算
+                if (tool.ToolType == ToolType.MachineCode)
+                    continue;
+
+                var category = ToolItem.GetToolCategory(tool.ToolSuffixType);
+
+                switch (category)
+                {
+                    case ToolCategory.Drill:
+                        if (minDrill == 0 || tool.Diameter < minDrill)
+                            minDrill = tool.Diameter;
+                        break;
+                    case ToolCategory.Slot:
+                        if (minSlot == 0 || tool.Diameter < minSlot)
+                            minSlot = tool.Diameter;
+                        break;
+                    case ToolCategory.EA:
+                        if (minEA == 0 || tool.Diameter < minEA)
+                            minEA = tool.Diameter;
+                        break;
+                }
+            }
+
+            selectionViewModel.StackCalcMinDrill = minDrill;
+            selectionViewModel.StackCalcMinSlot = minSlot;
+            selectionViewModel.StackCalcMinEA = minEA;
+        }
     }
 }