Reactive Simulation and Analytics Integrating marimo with gprMax

gprMax users currently visualize simulation output using static terminal scripts with no interactivity. This project builds a reactive web-based dashboard using marimo, replacing that workflow with four components: parameter controls with live geometry preview, a simulation progress tracker, post-processing visualization for A-scans and B-scans, and a set of Reactive Recipes for common modelling scenarios. A working prototype covering all three visualization components is already built and running against real gprMax HDF5 output on the devel branch.