feat: persist plate optimizer settings across autonest runs

Add LoadPlateOptions() method to AutoNestForm that restores saved plate
options and salvage rate from the Nest. Call this method in
RunAutoNest_Click when opening the dialog if saved options exist, and save
settings back to Nest after dialog completion.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest/Forms/AutoNestForm.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Linq;
 using System.Windows.Forms;
 
 namespace OpenNest.Forms
@@ -76,6 +77,22 @@ namespace OpenNest.Forms
             plateOptionsGrid.DataSource = items;
         }
 
+        public void LoadPlateOptions(List<PlateOption> options, double salvageRate)
+        {
+            if (options != null && options.Count > 0)
+            {
+                var items = options.Select(o => new PlateOptionItem
+                {
+                    Width = o.Width,
+                    Length = o.Length,
+                    Cost = o.Cost,
+                }).ToList();
+                plateOptionsGrid.DataSource = items;
+                optimizePlateSizeBox.Checked = true;
+            }
+            SalvageRate = salvageRate;
+        }
+
         private void optimizePlateSizeBox_CheckedChanged(object sender, EventArgs e)
         {
             plateOptionsPanel.Visible = optimizePlateSizeBox.Checked;

OpenNest/Forms/MainForm.cs

@@ -900,6 +900,9 @@ namespace OpenNest.Forms
             var form = new AutoNestForm(activeForm.Nest);
             form.AllowPlateCreation = true;
 
+            if (activeForm.Nest.PlateOptions.Count > 0)
+                form.LoadPlateOptions(activeForm.Nest.PlateOptions, activeForm.Nest.SalvageRate);
+
             if (form.ShowDialog() != System.Windows.Forms.DialogResult.OK)
                 return;
 
@@ -912,6 +915,12 @@ namespace OpenNest.Forms
             var plateOptions = optimizePlateSize ? form.GetPlateOptions() : null;
             var salvageRate = form.SalvageRate;
 
+            if (optimizePlateSize)
+            {
+                activeForm.Nest.PlateOptions = plateOptions;
+                activeForm.Nest.SalvageRate = salvageRate;
+            }
+
             nestingCts = new CancellationTokenSource();
             var progressForm = new NestProgressForm(nestingCts, showPlateRow: true);
             progressForm.PreviewPlate = CreatePreviewPlate(activeForm.PlateView.Plate);