`<link rel=preload>` missing `as` attribute in RSC framework bundle

[jodaks]

Description

The framework bundle emits <link rel=preload> tags without a valid as attribute,
causing a browser console error on every page load.

Error

[Error] must have a valid as value
wf (framework-BsFTGslG.js:9:17874)
he (index-DsvxdoIr.js:2:21280)
r (index-DsvxdoIr.js:2:23571)

Environment

• vinext: 0.0.30
• vite: 8.0.0
• @vitejs/plugin-rsc: 0.5.21
• React: 19.2.4
• Router: App Router
• Deploy target: Cloudflare Workers

Steps to Reproduce

1. Create a standard App Router project with vinext
2. Run vinext dev or deploy and open the browser console
3. Observe the error on every route

Expected Behavior

Preload hints should include a valid as attribute (e.g. as="script", as="style")
per the HTML spec. https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload

Notes

Originates inside the minified framework bundle, not reproducible from application code.
Likely related to how RSC emits resource hints during streaming/hydration.