Add tutorial on visualization with Plots.jl and interpolation

[efaulhaber]

Find the rendered docs for this PR here:
https://trixi-framework.org/TrixiParticles.jl/previews/PR1298/tutorials/tut_visualization/

[efaulhaber]

Codex Review

The PR adds a Plots-based visualization tutorial, integrates it into the generated documentation, and links it from the tutorial and visualization pages. The tutorial's VTK export can fail in a clean working directory, and its particle plot applies fluid-only values to every plotted system.

This is an AI-generated code review. Please verify the findings and summary before acting on them.
_{Review generated by codex-pr-review}

[codecov]

Codecov Report

❌ Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.44%. Comparing base (26c5fcc) to head (df6c37e).

Files with missing lines	Patch %	Lines
src/visualization/recipes_plots.jl	0.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1298      +/-   ##
==========================================
- Coverage   90.49%   90.44%   -0.05%     
==========================================
  Files         139      139              
  Lines       11337    11343       +6     
==========================================
  Hits        10259    10259              
- Misses       1078     1084       +6     

Flag	Coverage Δ
total	90.45% <0.00%> (-0.05%)	⬇️
unit	77.54% <0.00%> (-0.05%)	⬇️

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