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)/students/api/students.ts

@@ -60,8 +60,8 @@ function getAll(
  */
 function addStudents(database: Database, students: Student[], promoId: string) {
   const query = `
-    INSERT INTO students 
-    (userId, firstName, lastName, mail, promotionId) 
+    INSERT INTO students
+    (userId, firstName, lastName, mail, promotionId)
     VALUES (?, ?, ?, ?, ?)`;
 
   const statement = database.prepare(query);
@@ -92,9 +92,9 @@ export const handler: Handlers<null, AuthenticatedState> = {
     using connection = connect("students");
     const database = connection.database;
 
-    if (context.state.session.eduPersonPrimaryAffiliation == "student") {
+    if (context.state.role == "etudiant") {
       return new Response(
-        JSON.stringify(getItself(database, context.state.session.uid)),
+        JSON.stringify(getItself(database, context.state.uid)),
         {
           headers: {
             "content-type": "application/json",