test: add test for catalog new

01.workspace/heave/src/str/catalog.rs

@@ -238,7 +238,10 @@ mod tests {
     #[test]
     fn new_should_create_catalog_with_path_and_empty_items() {
         // Should create a new Catalog with the given path and an empty 'items' map.
-        todo!();
+        let path = "test.db";
+        let catalog = Catalog::new(path);
+        assert_eq!(catalog.path, path);
+        assert!(catalog.items.is_empty());
     }
 
     // ## 'init()'