Post-processing module in esd

eigenspacedesign should include a dedicated post-processing module to help users visualize and extract simulation results after the solver run is complete.

Expected capabilities:

• View displacement, stress, strain, and other result fields

• Show legends, min/max/average statistics, and units

• Inspect results at selected points or regions

• Use cutting planes, iso-surfaces, and result filters

• Save, download, and share result views

• Support screenshots for reports and documentation