message: preload wasm and js
diff: @@ -178,6 +178,8 @@ fn html(title: &str, backend_build_id: Uuid, frontend_build_id: Uuid) -> String
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
  <title>{title}</title>
  + <link rel="preload" href="/pkg/frontend_bg_{frontend_build_id}.wasm" as="fetch" type="application/wasm" crossorigin>
  + <link rel="preload" href="/pkg/frontend_{frontend_build_id}.js" as="script" type="text/javascript" crossorigin>
  </head>
  <body>
  