feat: add .ms_plot accessor to Pandas DataFrames for API parity

pyopenms_viz/__init__.py

@@ -10,6 +10,7 @@
 import types
 from pathlib import Path
 from ._core import plot_chromatogram, plot_spectrum, plot_mobilogram, plot_peakmap
+from . import _pandas_accessor  # Import for side effects: registers Pandas 'ms_plot' namespace. noqa: F401
 
 __version__ = "1.0.1"
 

pyopenms_viz/_pandas_accessor.py

@@ -0,0 +1,15 @@
+import pandas as pd
+
+@pd.api.extensions.register_dataframe_accessor("ms_plot")
+class PandasPlotAccessor:
+    """
+    Registers a custom '.ms_plot' namespace for Pandas DataFrames.
+    This provides a unified API syntax alongside the Polars integration.
+    """
+    def __init__(self, pandas_obj):
+        self._df = pandas_obj
+
+    def __call__(self, *args, **kwargs):
+        # Delegate directly to the native pandas plot method.
+        # This ensures all existing ms_* backends and entry points work perfectly.
+        return self._df.plot(*args, **kwargs)