Refactor admin routes to use new AppError struct in responses

src/authentication.rs

@@ -1,5 +1,7 @@
 use crate::{
-    routes::AdminError, session_state::TypedSession, telemetry::spawn_blocking_with_tracing,
+    routes::{AdminError, AppError},
+    session_state::TypedSession,
+    telemetry::spawn_blocking_with_tracing,
 };
 use anyhow::Context;
 use argon2::{
@@ -135,7 +137,7 @@ pub async fn require_auth(
     session: TypedSession,
     mut request: Request,
     next: Next,
-) -> Result<Response, AdminError> {
+) -> Result<Response, AppError> {
     let user_id = session
         .get_user_id()
         .await