frontend: Only show logout button when logged in

crates/frontend/src/pages/user.rs

@@ -2,6 +2,8 @@ use askama::Template;
 use askama_web::WebTemplate;
 use rustical_store::auth::Principal;
 
+use crate::pages::DefaultLayoutData;
+
 pub trait Section: Template {
     fn name() -> &'static str;
 }
@@ -12,3 +14,9 @@ pub struct UserPage<S: Section> {
     pub user: Principal,
     pub section: S,
 }
+
+impl<S: Section> DefaultLayoutData for UserPage<S> {
+    fn get_user(&self) -> Option<&Principal> {
+        Some(&self.user)
+    }
+}