feat(download): allow anonymous download of public data

src/commands/download.rs

@@ -1,6 +1,6 @@
-use crate::cache::{create_authenticated_conn, load_cache_with_token_refresh};
+use crate::cache::create_readonly_conn;
 use crate::commands::shared::{
-    find_file_by_name, find_folder_limited, find_lab_in_cache, find_subfolder_by_name,
+    find_file_by_name, find_folder_limited, find_laboratory, find_subfolder_by_name,
     parse_remote_path,
 };
 use crate::connection::{ApiRequestLimiter, MDRSConnection};
@@ -18,10 +18,10 @@ pub async fn download(
     excludes: Vec<String>,
 ) -> Result<(), anyhow::Error> {
     let (remote, labname, r_path) = parse_remote_path(remote_path)?;
-    let cache = load_cache_with_token_refresh(&remote).await?;
-    let conn = Arc::new(create_authenticated_conn(&remote, &cache)?);
+    let (conn, cache) = create_readonly_conn(&remote).await?;
+    let conn = Arc::new(conn);
     let limiter = ApiRequestLimiter::new(crate::settings::SETTINGS.concurrent);
-    let lab = find_lab_in_cache(&cache, &labname)?;
+    let lab = find_laboratory(&conn, cache.as_ref(), &labname).await?;
 
     // Validate that local_path is an existing directory (matching Python's behaviour).
     let local_real = std::fs::canonicalize(local_path)