feat: add customer contract number to project view and update project query

src/app/projects/[id]/page.js

@@ -588,10 +588,19 @@ export default function ProjectViewPage() {
 								</div>
 								<div>
 									<span className="text-sm font-medium text-gray-500 block mb-1">
-										Nazwa umowy
+										Numer umowy klienta
 									</span>
 									<p className="text-gray-900 font-medium">
-										{project.contract_name || "N/A"}
+										{project.customer_contract_number ? (
+											<Link 
+												href={`/contracts/${project.contract_id}`}
+												className="text-inherit hover:text-inherit no-underline"
+											>
+												{project.customer_contract_number}
+											</Link>
+										) : (
+											"N/A"
+										)}
 									</p>
 								</div>
 								<div>