Move invoice PAID stamp inline to header; add email to company block

- Remove watermark overlay layer; PAID badge now sits centered between
  the header row and the accent rule so it never obscures line items
- Add PrimaryContactEmail to company info block in header
- Remove ComposePaidStamp helper (no longer needed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Application/Services/PdfService.cs

@@ -98,12 +98,7 @@ public class PdfService : IPdfService
                     page.DefaultTextStyle(x => x.FontSize(10).FontFamily("Arial"));
 
                     page.Header().Element(c => ComposeInvoiceHeader(c, companyLogo, companyInfo, accentColor, invoiceDto));
-                    page.Content().Layers(layers =>
+                    page.Content().Element(c => ComposeInvoiceContent(c, invoiceDto, accentColor, template));
-                    {
-                        layers.PrimaryLayer().Element(c => ComposeInvoiceContent(c, invoiceDto, accentColor, template));
-                        if (invoiceDto.Status == InvoiceStatus.Paid)
-                            layers.Layer().Element(c => ComposePaidStamp(c));
-                    });
                     page.Footer().AlignCenter().Text(text =>
                     {
                         text.CurrentPageNumber();
@@ -148,6 +143,8 @@ public class PdfService : IPdfService
                         column.Item().Text(cityLine).FontSize(9).FontColor(Colors.Grey.Darken1);
                     if (!string.IsNullOrWhiteSpace(companyInfo.Phone))
                         column.Item().Text(FormatPhoneNumber(companyInfo.Phone)).FontSize(9).FontColor(Colors.Grey.Darken1);
+                    if (!string.IsNullOrWhiteSpace(companyInfo.PrimaryContactEmail))
+                        column.Item().Text(companyInfo.PrimaryContactEmail).FontSize(9).FontColor(Colors.Grey.Darken1);
                 });
 
                 row.RelativeItem().AlignRight().Column(column =>
@@ -161,29 +158,18 @@ public class PdfService : IPdfService
                 });
             });
 
-            col.Item().PaddingVertical(4).LineHorizontal(1).LineColor(accentColor);
+            if (invoice.Status == InvoiceStatus.Paid)
+            {
+                col.Item().PaddingVertical(6).AlignCenter().Column(badge =>
+                {
+                    badge.Item().AlignCenter().Border(2).BorderColor(Colors.Green.Darken1)
+                        .PaddingVertical(4).PaddingHorizontal(24)
+                        .Text("PAID").FontSize(18).Bold().FontColor(Colors.Green.Darken1).LetterSpacing(0.15f);
                 });
             }
 
-    /// <summary>
+            col.Item().PaddingVertical(4).LineHorizontal(1).LineColor(accentColor);
-    /// Renders a semi-transparent angled PAID stamp centred over the invoice content layer.
+        });
-    /// Uses QuestPDF layout primitives (AlignCenter, AlignMiddle, Rotate, Opacity) so no
-    /// external Skia/SkiaSharp dependency is needed.
-    /// </summary>
-    private static void ComposePaidStamp(IContainer container)
-    {
-        container
-            .AlignCenter()
-            .AlignMiddle()
-            .Rotate(-45f)
-            .Border(2)
-            .BorderColor(Colors.Green.Lighten2)
-            .PaddingVertical(10)
-            .PaddingHorizontal(20)
-            .Text("PAID")
-            .FontSize(52)
-            .Bold()
-            .FontColor(Colors.Green.Lighten2);
     }
 
     /// <summary>