Interactive jelly island with wobbling sea, palms, and mouse-driven storms

Build "Island Jelly", an interactive material study: one self-contained HTML file, native WebGPU + WGSL, no libraries, no external requests (no fonts, CDNs or images). It belongs to an editorial series called "MATERIAL STUDIES": quiet paper backdrop, serif italic headline, small uppercase sans labels, a glassy control panel. The subject is a square slice of jelly-sea cut out like a dessert: a small sandy island with three gummy palms in a block of tinted, wobbly "sea jelly". You can stir it with a finger, tip the whole block, and throw coconuts and pebbles into it.