Thicken table borders to improve PDF visibility

Adjust border thickness in `pdf-html-renderer.ts` and `pdf-renderer.ts` from 1px to 1.5px to ensure navy borders are clearly rendered in PDF outputs.

artifacts/api-server/src/lib/pdf-html-renderer.ts

@@ -404,7 +404,7 @@ tbody td {
   padding: 10px 12px;
   vertical-align: top;
   text-align: center;
-  border: 1px solid #0B1E3F;
+  border: 1.5px solid #0B1E3F;
   font-size: ${fontSize}px;
   line-height: 1.8;
   word-wrap: break-word;

artifacts/api-server/src/lib/pdf-renderer.ts

@@ -978,7 +978,7 @@ async function renderSchedulePdf_LEGACY(input: RenderPdfInput): Promise<Buffer>
     }
 
     doc.save();
-    doc.lineWidth(0.5).strokeColor("#0B1E3F");
+    doc.lineWidth(1.5).strokeColor("#0B1E3F");
     doc.rect(tableX, rowTop, tableWidth, rowHeight).stroke();
     let bx = tableX;
     for (let i = 0; i < cells.length - 1; i++) {