Unify UME World as hex nav with conditional flat world map.

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>

netx_api/topology_router.py

@@ -291,10 +291,71 @@ def api_create_view(body: TopologyViewCreate, db: Session = Depends(get_db)) ->
 
 
 @router.get("/views/{view_id}")
-def api_get_view(view_id: str, db: Session = Depends(get_db)) -> dict[str, Any]:
+def api_get_view(
+    view_id: str,
+    min_x: float | None = Query(default=None),
+    max_x: float | None = Query(default=None),
+    min_y: float | None = Query(default=None),
+    max_y: float | None = Query(default=None),
+    sbn_id: str = Query(default=""),
+    folder_id: str = Query(default=""),
+    lod: str = Query(default="auto", description="auto|sbn|me"),
+    status: str = Query(default="active"),
+    db: Session = Depends(get_db),
+) -> dict[str, Any]:
+    from .topology_views_tree import _get_view_or_404
+    from .ume_topology_world import is_ume_canvas_view
+    from .ume_topology_world_graph import get_ume_canvas_graph
+
+    row = _get_view_or_404(db, view_id)
+    if is_ume_canvas_view(row):
+        return get_ume_canvas_graph(
+            db,
+            view_id,
+            min_x=min_x,
+            max_x=max_x,
+            min_y=min_y,
+            max_y=max_y,
+            sbn_id=sbn_id,
+            folder_id=folder_id,
+            lod=lod,
+            status=status,
+        ).model_dump()
     return get_view_graph(db, view_id).model_dump()
 
 
+@router.get("/folders/{folder_id}/bbox")
+def api_folder_bbox(folder_id: str, db: Session = Depends(get_db)) -> dict[str, Any]:
+    from .ume_topology_world import folder_bbox
+
+    box = folder_bbox(db, folder_id)
+    if box is None:
+        raise HTTPException(status_code=404, detail="bbox_unavailable")
+    return {"folder_id": folder_id, **box}
+
+
+@router.get("/world")
+def api_get_world(db: Session = Depends(get_db)) -> dict[str, Any]:
+    from .ume_topology_world import ensure_ume_world_and_sbn_folders, get_world_view
+
+    ensure_ume_world_and_sbn_folders(db)
+    view = get_world_view(db)
+    if view is None:
+        raise HTTPException(status_code=404, detail="world_view_missing")
+    return {"view_id": view.id, "folder_id": view.folder_id or "", "name": view.name}
+
+
+@router.post("/world/apply-ume")
+def api_apply_ume_world(db: Session = Depends(get_db)) -> dict[str, Any]:
+    """Manual: dock tables → fabric coords/edges + SBN folders (does not pull UME)."""
+    from .ume_topology_apply import apply_ume_topology_to_fabric
+    from .ume_topology_world import ensure_ume_world_and_sbn_folders
+
+    apply_stats = apply_ume_topology_to_fabric(db)
+    world_stats = ensure_ume_world_and_sbn_folders(db)
+    return {"ok": True, "fabric_apply": apply_stats, "world": world_stats}
+
+
 @router.patch("/views/{view_id}")
 def api_patch_view(
     view_id: str, body: TopologyViewUpdate, db: Session = Depends(get_db)