🧪 Invisibility Field (2D): Cloaking & Radar Detection Sweep

This 2D companion trades the orbiting Three.js scene of the original for a flat radar-style view built to make the cloaking mechanics legible: each drifting shape carries an opacity of 1 − cloaking level while active, a field-stability slider jitters the boundary ring, an energy slider drives the glow of each object's cloak field, and a rotating detection sweep — controlled by its own sensitivity slider — periodically flashes cloaked shapes back toward full visibility as it crosses them, making the trade-off between staying hidden and staying stable directly readable on a single canvas.