redesign: modern dark UI replacing Win95 style — gradient buttons, glassmorphism, responsive

feat: activer maillage par défaut après génération 3D

fix: 6 bugs from code review — animate crash, wireframe reset, GZip/GLB, memory leaks

perf: 3D optimization audit — 11 fixes applied

feat: make API key bar always visible, full-width with placeholder

feat: rename SPLAT EXPLORER → 3D EXPLORER

fix: API key button label and placeholder

feat: retro B&W Windows 3.1 style UI

feat: 512 resolution + custom export filename

fix: wireframe via Three.js overlay canvas (global scripts, no importmap)

fix: wireframe uses load event + modelLoaded flag

feat: wireframe toggle + bg color on model-viewer

fix: remove Three.js viewer, model-viewer full width

fix: Three.js viewer — offsetWidth fallback, controls.update(), near/far, error display

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