make login username case insensitive

backend/src/auth.rs

@@ -71,7 +71,9 @@ pub async fn login(
     let req = request.into_inner();
     let users = user_list.lock().await;
 
-    if let Some(user) = users.iter().find(|u| u.person.name == req.username)
+    if let Some(user) = users
+        .iter()
+        .find(|u| u.person.name.to_lowercase() == req.username.to_lowercase())
         && bcrypt::verify(&req.password, &user.password_hash).unwrap_or(false)
     {
         let token = Uuid::new_v4().to_string();