Transform Gizmo

Transform gizmo, three slender smooth rods 1 m long from a small sphere hub on y = 0, along +x, +y, +z; mode is move (cone tips), rotate (three thin quarter-arcs) or scale (small cube tips), tips holding letter decal slots; axis.

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