fix(report): use parts per plate consistently

OpenNest.Reporting/NestPdfWriter.cs

@@ -131,7 +131,7 @@ public static class NestPdfWriter
         else
         {
             var plates = AddTable(section, 60, 200, 80, 100, 100);
-            AddHeader(plates, "Plate", "Stock size", "Quantity", "Parts/sheet", "Utilization");
+            AddHeader(plates, "Plate", "Stock size", "Quantity", "Parts per plate", "Utilization");
             foreach (var plate in snapshot.Plates)
                 AddRow(plates, $"Plate {plate.Number}", false, plate.Number.ToString(Invariant), SheetSize(snapshot, plate),
                     plate.Copies.ToString(Invariant), plate.Parts.Length.ToString(Invariant), Percent(plate.Utilization));
@@ -172,13 +172,13 @@ public static class NestPdfWriter
         title.Format.Font.Size = 13;
         title.Format.Font.Bold = true;
 
-        var info = AddTable(section, 80, 280, 90, 270);
+        var info = AddTable(section, 100, 260, 90, 270);
         info.Borders.Visible = false;
         AddInfoRow(info, "Nest:", snapshot.Name, "Sheet size:", SheetSize(snapshot, plate));
         AddInfoRow(info, "Material:", Material(snapshot), "Quantity:", plate.Copies.ToString(Invariant));
         AddInfoRow(info, "Thickness:", Thickness(snapshot), "Part spacing:",
             $"{Number(plate.PartSpacing)} {snapshot.Units}");
-        AddInfoRow(info, "Parts/sheet:", plate.Parts.Length.ToString(Invariant), "Utilization:",
+        AddInfoRow(info, "Parts per plate:", plate.Parts.Length.ToString(Invariant), "Utilization:",
             Percent(plate.Utilization) + " (net part area / full sheet)");
 
         var overview = AddReservedArea(section, null, plan.Overview.Size.Height);
@@ -204,7 +204,7 @@ public static class NestPdfWriter
         var perSheet = plate.Parts.GroupBy(part => part.ReportId, StringComparer.Ordinal)
             .ToDictionary(group => group.Key, group => (long)group.Count(), StringComparer.Ordinal);
         var parts = AddTable(section, 60, 400, 110, 150);
-        AddHeader(parts, "ID", "Drawing", "Qty/sheet", $"Total ({plate.Copies} plates)");
+        AddHeader(parts, "ID", "Drawing", "Parts per plate", $"Total ({plate.Copies} plates)");
         foreach (var drawing in snapshot.Drawings.Where(drawing => perSheet.ContainsKey(drawing.Id)))
         {
             var count = perSheet[drawing.Id];

OpenNest.Tests/Reporting/NestPdfLayoutTests.cs

@@ -85,7 +85,7 @@ public sealed class NestPdfLayoutTests : IDisposable
         // Every page carrying plate-table rows repeats the table heading.
         var tablePages = platePages.Where(page => Regex.IsMatch(page, @"(?m)^R\d{3}\s+Demand \d{2}\s+1\s+2$")).ToList();
         Assert.True(tablePages.Count >= 2, $"plate table pages: {tablePages.Count}");
-        Assert.All(tablePages, page => Assert.Matches(@"ID\s+Drawing\s+Qty/sheet\s+Total \(2 plates\)", page));
+        Assert.All(tablePages, page => Assert.Matches(@"ID\s+Drawing\s+Parts per plate\s+Total \(2 plates\)", page));
         var plateText = string.Join("\n", platePages);
         for (var i = 0; i < 40; i++)
             Assert.Matches($@"R{i + 4:D3}\s+Demand {i:D2}\s+1\s+2", plateText);
@@ -114,7 +114,7 @@ public sealed class NestPdfLayoutTests : IDisposable
         var platePage = Array.FindIndex(pages, page => page.Contains("Plate 1 of 4"));
         Assert.True(summaryPage >= 0 && platePage > summaryPage);
         Assert.Equal(longName.Replace(" ", ""), ColumnText(path, summaryPage + 1, "Drawing", "Required"));
-        Assert.Equal(longName.Replace(" ", ""), ColumnText(path, platePage + 1, "Drawing", "Qty/sheet"));
+        Assert.Equal(longName.Replace(" ", ""), ColumnText(path, platePage + 1, "Drawing", "Parts"));
         // Column headings stay on one line.
         Assert.Matches(@"ID\s+Part\s+Drawing\s+Required\s+Nested\s+Shortage\s+Extra\s+Plates", pages[summaryPage]);
     }

OpenNest.Tests/Reporting/NestPdfWriterTests.cs

@@ -53,6 +53,8 @@ public sealed class NestPdfWriterTests : IDisposable
         Assert.Matches(@"R003\s+Bracket\s+7\s+2\s+5\s+0\s+1", summary);
         Assert.Matches(@"R004\s+Unplaced\s+3\s+0\s+3\s+0\s+-", summary);
         Assert.Contains("Page 1 of 2", summary);
+        Assert.Matches(@"Stock size\s+Quantity\s+Parts per plate", summary);
+        Assert.DoesNotContain("Parts/sheet", summary + plate);
         Assert.DoesNotContain("Copies", summary + plate);
 
         Assert.Contains("Plate 1", plate);

docs/nest-reports.md

@@ -54,7 +54,9 @@ each plate's part table across pages with the heading row repeated, and notes
 flow as an ordinary paragraph. No row, table or note text is ever dropped or
 truncated to fit a page.
 
-Stock sizes read **width x length** in job units. Plate counts use **Quantity**.
+Stock sizes read **width x length** in job units. Plate tables use **Quantity**
+and **Parts per plate**; the plate quantity multiplies per-plate part counts for
+the totals.
 
 Each part ID is centered on its part's pole of inaccessibility (`PolyLabel`,
 the same method `PlateView`'s `LayoutPart` uses), computed on a