Progress Bar

Progress bar, a slim matte pill track 0.24 x 0.012 m, 0.003 m thick (length 0.12-0.48 m, ends never scale), with a glowing accent fill pill reaching to value (0-1, default 0.6). Hover floats it up and glows; pressed settles it; selected holds it down, lit.

风格：low-poly, flat-shaded vertex colors, no textures, 2 materials: the shared opaque one plus a distinct surface (glass, water or chrome), which stays its own mesh through mergeAssets rather than merging into the rest; shares palette and scale with its kit