Interactive jelly marlin physics study with translucent color modes

GOAL: Make an interactive WebGPU soft-body jelly study of a blue marlin (XPBD tetrahedral soft body, SDF geometry, surface-nets render meshes, two jelly layers, refraction and Beer–Lambert absorption), in the style of the jelly whale and hammerhead studies. Anatomy: tall narrow body with a high nape, slim raised tail stalk with caudal keels, a long tapered round bill with a shorter lower jaw, a big eye; a tall raked sail of a front dorsal lobe running into a low crest, second dorsal and anal finlets, first anal fin, long sickle pectorals, thin pelvic spikes, and a high crescent tail — all from one fin recipe with convex leading and falcate trailing edges. Clear cobalt jelly over a milky silver belly with an angle-dependent sheen, dark back and fins as a pigment film, about fifteen flank bars made of spots and dashes, fin rays, gill cover, gape, nostrils and lateral line as normal bumps. Muscle-strain actions: tail swish, a quick side-to-side bill slash through beads of bait, folding/raising the sail by squashing its tets vertically with volume kept, and a "light up" mode where the bars glow electric blue (also flashing with each slash/swish). Palettes Cobalt, Lilac, Midnight, Sunrise; live readouts for mass, volume, bill-to-fork length and sail height; English UI.