Refactor AuthenticatedState to store displayName and uid

The AuthenticatedState interface was updated to directly store the
`displayName` and `uid` properties. Previously, it stored the entire
`CasContent` object, which contained these properties along with others
that were not consistently used. This change simplifies the interface
and reduces redundancy.

routes/(apps)/_middleware.ts

@@ -23,7 +23,7 @@ export const handler: MiddlewareHandler<AuthenticatedState>[] = [
 
     context.state.availablePages = properties.pages;
     if (
-      context.state.session.eduPersonPrimaryAffiliation == "student" &&
+      context.state.role == "etudiant" &&
       Deno.env.get("LOCAL") != "true"
     ) {
       properties.adminOnly.forEach((page) =>