This is not an error

Next JS is telling you that the html files are rendered staticly, that means pre-generated at build time : you're /login and /dashboard pages are both generated inside the ".next" folder.

If you want to render dynamicly you can use route segment config at a page level https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config

You can opt in differents type of rendering depending of what you want but Next has also automatics behaviors that you should be aware of, like caching for your request and so on.

Ok I got you, so it can be in production?

sorry I am new to this version

I added this to the page level which is layout.tsx

Yes so now instead of a circle, aside your page you should have a lambda sign that mean that the page is now rendered dynamicly (on demand, when someone visits the page)

There's others options to activate or not this behavior

like using cookies, dynamic segment routes and other ones

You got 3 main rendering techniques :
In production a static rendered page will never be rebuild, this is SSG. (static site generation)
If you opt in a revalidation feature, like export const revalidate = 60 , then it's ISG (incremental static generation, got some trouble with this one :p)
And if you opt in a dynamic rendering feature, like you got here, then it's SSR (server side generation)