%matplotlib magic should delegate backend resolution to Matplotlib and fix interactive-loop detection

%matplotlib magic should delegate backend resolution to Matplotlib and fix interactive-loop detection: a task in LegoFlow-SWE (Harbor dataset). After the changes: Accessing IPython.core.pylabtools.backends or ...backend2gui triggers a DeprecationWarning . %matplotlib --list displays backends known…

The task

After the changes: * Accessing `IPython.core.pylabtools.backends` or `...backend2gui` triggers a `DeprecationWarning`. * `%matplotlib --list` displays backends known to Matplotlib (e.g., `['gtk3agg', 'gtk4agg', 'inline', 'ipympl', 'module://...', 'qtagg', ...]` when using modern Matplotlib). * Older Matplotlib users…

Part of Lego-X/LegoFlow-SWE.