feat: allow PSD plots to show

[germa89]

Description

As the title.

Issue linked

Close #906

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

New Features:

• Add PSDG and SPGR to supported plot commands to enable PSD and spectral group visualizations

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

PLOT_COMMANDS in mapdl_core.py is extended to include PSDG and SPGR, enabling PSD and spectral plots to be displayed by the core plotting logic.

Class diagram for updated PLOT_COMMANDS in mapdl_core.py

classDiagram
    class mapdl_core {
        +PLOT_COMMANDS: List[str]
        ...
    }
    note for mapdl_core "PLOT_COMMANDS now includes 'PSDG' and 'SPGR' for PSD and spectral plots."

Loading

File-Level Changes

Change	Details	Files
Extend PLOT_COMMANDS whitelist to support PSD plots	Added 'PSDG' and 'SPGR' entries to the PLOT_COMMANDS list	src/ansys/mapdl/core/mapdl_core.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#906	Enable plotting of the PSD input curve using mapdl.psdgraph(1) so that the plot is displayed or accessible.	✅

Possibly linked issues

• Display PSD input curve #906: The PR enables PSD plots by adding PSDG and SPGR to plot commands, directly addressing the issue.

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[Copilot]

Pull Request Overview

This PR adds support for Power Spectral Density (PSD) plots by including PSD-related commands in the PLOT_COMMANDS list. This change allows PSD plots to be properly displayed in PyMAPDL.

• Refactored PLOT_COMMANDS from inline list to multi-line format for better readability
• Added "PSDG" and "SPGR" commands to enable PSD plotting functionality

[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.39%. Comparing base (f021ab2) to head (1c46ce4).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4116   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files         189      189           
  Lines       15667    15667           
=======================================
  Hits        14319    14319           
  Misses       1348     1348           

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬