fix(web): decode textures as sRGB in 3D viewers

TextureLoader leaves colorSpace as NoColorSpace, so card, tile, token, model, and part art is uploaded as linear and then double-decoded in the shader, washing out contrast. Mark each texture sRGB so the GPU decodes it once, correctly.

packages/tabletop/src/partView.tsx

@@ -86,6 +86,13 @@ export function PartMesh({ part, baseUrl }: { part: Part; baseUrl?: string }) {
   const face = useTexture(faceUrl ? assetUrl(faceUrl) : FALLBACK_URL);
   const back = useTexture(backUrl ? assetUrl(backUrl) : FALLBACK_URL);
 
+  // Part art is sRGB-encoded; `TextureLoader` leaves `colorSpace` as
+  // `NoColorSpace`, which double-decodes it in the shader and washes out
+  // contrast. Mark it sRGB so the GPU decodes it once, correctly. The sprite
+  // clones below inherit this from the source.
+  face.colorSpace = THREE.SRGBColorSpace;
+  back.colorSpace = THREE.SRGBColorSpace;
+
   const trace = useTrace(shapeUrl, traceImage);
 
   const { frontGeo, backGeo, wallsGeo } = useMemo(() => {