Add crossorigin attribute to manifest link (#1513)

Reason why see: https://github.com/cloudflare/cloudflare-docs/blob/production/src/content/docs/cloudflare-one/access-controls/applications/http-apps/authorization-cookie/cors.mdx?utm_source=chatgpt.com and similiar: https://github.com/open-webui/open-webui/issues/1538

src/app.html

@@ -6,7 +6,7 @@
 		<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
 		<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
 		<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
-		<link rel="manifest" href="/site.webmanifest" />
+		<link rel="manifest" href="/site.webmanifest" crossorigin="use-credentials" />
 		%sveltekit.head%
 	</head>
 	<body data-sveltekit-preload-data="hover">