Biodiesel Kinetics & Settling (2D): Reaction Chart + Density Column

This is a 2D-native counterpart to the 3D biodiesel reactor. Rather than watching 150 spheres drift in a tank, you get two linked, physically independent panels: a live mean-field concentration chart that integrates the same Arrhenius-driven TG→DG→MG→GL reaction ladder as a deterministic ODE (instead of per-particle Monte-Carlo dice rolls), and a density-settling column that gives every biodiesel and glycerol droplet a real Stokes'-law terminal velocity derived from its density difference against the mixture and the temperature-dependent viscosity of the oil. Catalyst loading and temperature speed the reaction; methanol:oil ratio sets how far it can push before the equilibrium cap stalls it; temperature and the turbulence slider additionally control how fast and how cleanly the two liquid layers separate afterward.