Coerce non-dict filter JSON so /tree no longer 500s, surface API failure details, and let users remove the UME World container for local resets.
Co-authored-by: Cursor <cursoragent@cursor.com>
Top-level folders are nav-only with a unique system root map; UI drops custom/extra L2 creates. Batched dock-to-Fabric apply avoids PG lock OOM so World NEs can render, with subtree region counts restored.
Co-authored-by: Cursor <cursoragent@cursor.com>
Seed a unique L2 World canvas under the UME World container, show the flat map only when nested regions have NEs, pack blocks without overlap, allow drag overrides on the world map while forbidding direct NE adds, and hide the world-map truncation banner.
Co-authored-by: Cursor <cursoragent@cursor.com>