add supplier management module

frontend/src/app/portal/managed-expense-claims/page.tsx

@@ -337,14 +337,15 @@ export default function ManagedExpenseClaimsPage() {
 
                           <div className="space-y-1">
                             {claim.attachments.map((attachment) => (
-                             <button
+                              <a
                                 key={attachment.id}
-                                type="button"
-                                onClick={() => openAttachment(attachment)}
-                                className="block w-full text-right rounded-lg border bg-white px-3 py-2 text-sm text-blue-600 hover:underline"
+                                href={`${process.env.NEXT_PUBLIC_API_URL}/hr/portal/expense-claims/attachments/${attachment.id}/view`}
+                                target="_blank"
+                                rel="noreferrer"
+                                className="block rounded-lg border bg-white px-3 py-2 text-sm text-blue-600 hover:underline"
                               >
                                 {attachment.originalName}
-                              </button>
+                              </a>
                             ))}
                           </div>
                         </div>