refactor(session): introduce cursor model and full command set

core/src/document/loader.rs

@@ -98,10 +98,4 @@ pub(crate) fn scan_directory_into(session: &mut SessionData, dir: &Path) {
 
         session.items = paths.into_iter().map(|p| SessionItem::new(p, 0)).collect();
     }
-
-    session.current_index = if session.items.is_empty() {
-        None
-    } else {
-        Some(0)
-    };
 }