Show HN: Prompt-to-Excalidraw demo with Gemma 4 E2B in the browser (3.1GB)

Gemma 4 E2B runs locally in desktop Chrome. KV cache compressed 2.4× via WGSL compute shaders. 30+ tok/s on M1, no server, no API key. Chrome 134+ desktop only — needs WebGPU subgroups + shader-f16.