feat(ui): add a Simulate Cutting toolbar button

Restore the toolbar shortcut for Plate > Simulate Cutting next to Plan
Cutting, using the cut_simulate icon.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

OpenNest/Forms/MainForm.cs

@@ -109,6 +109,8 @@ namespace OpenNest.Forms
                 plateIndexStatusLabel, plateSizeStatusLabel, plateQtyStatusLabel, plateUtilStatusLabel);
             toolStrip1.Items.Add(CreateActionButton("btnCutPlanner", "Plan Cutting",
                 Resources.cut_planner, PlatePlanCutting_Click));
+            toolStrip1.Items.Add(CreateActionButton("btnSimulateCutting", "Simulate Cutting",
+                Resources.cut_simulate, SimulateCutting_Click));
             toolStrip1.Items.Add(CreateActionButton("btnManualSequence", "Manual Sequence",
                 Resources.manual_sequence, ManualSequenceParts_Click));
             toolStrip1.Items.Add(postButton);

OpenNest/Properties/Resources.Designer.cs

@@ -70,6 +70,16 @@ namespace OpenNest.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap cut_simulate {
+            get {
+                object obj = ResourceManager.GetObject("cut_simulate", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+
         /// <summary>
         ///   Looks up a localized resource of type System.Drawing.Bitmap.
         /// </summary>

OpenNest/Properties/Resources.resx

@@ -190,6 +190,9 @@
   <data name="shapes" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\shapes.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="cut_simulate" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\cut_simulate.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="cut_planner" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\cut_planner.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>