Nanowarming 2D: Radial Heat Profile & SAR Curve

This is the 2D counterpart to the 3D nanowarming scene, computing the identical radial heat-equation model of magnetic-nanoparticle inductive rewarming through four analytic panels instead of a rendered organ: a flat cross-section shaded by temperature, a radial profile from center to surface, the SAR-vs-frequency curve that sets the volumetric heat source, and a core/surface-vs-time trace through the ice-nucleation danger band. Tune the nanoparticle concentration, AMF frequency and amplitude, bath temperature and organ radius, switch between nanowarming and convective-only heating, and watch every readout react to the same equations driving the plots.