Extend `plotSolution` to visualize arbitrary geometries

[nikoscham]

The plotSolution function currently supports:

• 1D line plots for scalar solutions (see e.g the tutorial)
• 2D contour plots for structured rectangular grids (reshaping node coordinates into grids) (see e.g the tutorial)
• 2D contour plots for unstructured meshes using node-based interpolation (via Plotly's contour type with x y z arrays) (see e.g the tutorial)

However, it does not handle true element-based visualization for arbitrary polygonal topologies.

Tasks:

• Introduce a new plotType option, e.g., "polygon"
• Use Plotly's scatter with fill: 'toself' or mesh3d to draw individual polygonal elements based on element connectivity (e.g., from nop arrays in meshGenerationScript.js)
• For each element, extract node coordinates and solution values to create filled polygons with color mapping

Example API usage: plotSolution(solutionVector, nodesCoordinates, solverConfig, "2D", "polygon", plotDivId);

[Pawankalyan2023]

Hi @nikoscham , I would like to take this issue can you assign this to me for hacktoberfest

[nikoscham]

Hi @Pawankalyan2023! Thanks for your interest in contributing to the FEAScript project. Visualizing arbitrary geometries is a core capability that will help drive the project’s future expansion. Feel free to reach out if you need any details or support. Please also consider ⭐️ the project!

Nikos