fix: DrawSectionLabel title style + thin borders + correct font in dividend renderer

CertReports.Syncfusion/Services/Implementations/DividendSectionRenderer.cs

@@ -78,11 +78,11 @@ public class DividendSectionRenderer
         float y  = PdfTheme.PageMargin;
 
         // ── Titolo stile DrawSectionLabel ─────────────────────────────
-        float rh0 = PdfTheme.RowHeight;
-        g.DrawRectangle(PdfTheme.TableHeaderBrush, new RectangleF(x0, y, w, rh0));
-        g.DrawString("Sottostanti e Dividendi", PdfTheme.TableBold, PdfBrushes.White,
-            new RectangleF(x0 + 4f, y + 2f, w - 8f, rh0));
-        y += rh0 + 4f;
+        g.DrawRectangle(PdfTheme.AccentBlueBrush, new RectangleF(x0, y, 3f, 14f));
+        g.DrawString("Sottostanti e Dividendi", PdfTheme.Bold,
+            new PdfSolidBrush(PdfTheme.AccentBlue),
+            new RectangleF(x0 + 6f, y, w - 6f, 14f));
+        y += 16f;
 
         // ── Calcolo fattore scala su larghezza reale ──────────────────
         float totalNominal = ColWidths.Sum();
@@ -228,6 +228,7 @@ public class DividendSectionRenderer
         }
 
         // Pagina singola: specifica garantisce max ~20 sottostanti per certificato
+        PdfTheme.ApplyThinBorders(grid);
         grid.Draw(g, new PointF(x0, y));
     }
 }