Catalogue story tree navigation

The updated editing experience makes it easier to navigate complex catalogue items by introducing a structured “Story” sidebar with component hierarchy visibility, active section highlighting, and inline error indicators. Users can quickly move between validation errors directly from the toolbar, reducing the time spent locating and fixing issues across long forms or deeply nested content.

The interface has also been refined with clearer empty states, improved separators, and better editor spacing to create a cleaner and more intuitive workflow. Additional synchronization improvements ensure the sidebar and validation states stay accurately updated while editing, resulting in a smoother and more reliable experience overall.