SkinningNode: Fix tangent transformation.

[Mugen87]

Fixed #32707.

Description

SkinningNode previously assigned the skinned normal to tangentLocal which looks not correct to me. According to what we do in WebGLRenderer, we must transform the tangent with the same skin matrix like the normal.

three.js/src/renderers/shaders/ShaderChunk/skinnormal_vertex.glsl.js

Line 15 in b3bdd22

objectTangent = vec4( skinMatrix * vec4( objectTangent, 0.0 ) ).xyz;

The PR is correcting this bit in SkinningNode.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	355.41 84.51	355.41 84.51	+0 B +0 B
WebGPU	620.99 172.41	621.09 172.47	+103 B +54 B
WebGPU Nodes	619.59 172.17	619.69 172.23	+103 B +55 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	487.36 119.29	487.36 119.29	+0 B +0 B
WebGPU	691.77 187.74	691.88 187.8	+103 B +57 B
WebGPU Nodes	641.58 174.9	641.68 174.96	+103 B +58 B