Add Python ParaView macro to visualize PULMTLN simulation results

[Copilot]

No tooling existed to load and display the ParaView output produced by PULMTLN runs. This adds a ready-to-use macro that discovers and renders all generated result files in one step.

New file: scripts/pulmtln_paraview_macro.py

• Folder selection — opens a native dialog (PySide2 → PyQt5 → tkinter fallback); also accepts a CLI argument when invoked via pvpython
• Auto-discovery — accepts either the top-level export folder or the ParaView/ subdirectory; finds all .pvd files (2N files for N conductors: one with dielectrics for C, one without for L)
• Rendering — loads each dataset via PVDReader, colors by Phi (electric scalar potential) with a color bar; E and D fields are also available
• Dual entry-point — works as a ParaView macro (Macros menu) or directly with pvpython

# CLI usage
pvpython scripts/pulmtln_paraview_macro.py Results/five_wires/

# ParaView GUI: Macros → Add New Macro → select file → run

For a five-wire case this loads 10 datasets (Conductor_1 … Conductor_5, each with and without dielectrics), all colored by Phi and visible in the Pipeline Browser for individual toggling.

Original prompt

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<issue_title>Add python Paraview macro to visualize all the generated results.</issue_title>
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Comments on the Issue (you are @copilot in this section)

• Fixes Add python Paraview macro to visualize all the generated results. #46

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