feat(diagram): schema grouping, collapse, Mermaid output, and bug fixes

src/datajoint/dependencies.py

@@ -137,6 +137,7 @@ def __init__(self, connection=None) -> None:
     def clear(self) -> None:
         """Clear the graph and reset loaded state."""
         self._loaded = False
+        self._node_alias_count = itertools.count()  # reset alias IDs for consistency
         super().clear()
 
     def load(self, force: bool = True) -> None: