TSL: Improve vec* checks and warnings

[sunag]

Description

Improves errors and prevents the renderer from crashing if the vector composition is larger than the supported type size.

Code

materialBox.colorNode = vec4( 1, 1, vec4() );

Now

Old

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.08 78.29	336.08 78.29	+0 B +0 B
WebGPU	532.29 147.91	531.5 147.68	-798 B -230 B
WebGPU Nodes	531.76 147.8	530.96 147.57	-798 B -231 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.15 112.18	465.15 112.18	+0 B +0 B
WebGPU	604 163.91	603.2 163.67	-802 B -248 B
WebGPU Nodes	559.03 153.36	558.23 153.1	-802 B -258 B