[FIX] Enforce WGSL syntax highlighting in all WGSL chunks

[willeastcott]

This pull request updates several shader chunk files to clarify that they use the WGSL shading language instead of GLSL. The change is made by updating the comment in the default export of each file from /* glsl */ to /* wgsl */. No functional or logic changes are introduced; this is a consistency and clarity improvement across the shader codebase.

Shader language annotation updates:

• Updated the language annotation in the default export from /* glsl */ to /* wgsl */ in the following files to accurately reflect the use of WGSL:
  • src/scene/shader-lib/wgsl/chunks/lit/frag/lighting/lightEvaluation.js
  • src/scene/shader-lib/wgsl/chunks/lit/frag/lighting/shadowPCF3.js
  • src/scene/shader-lib/wgsl/chunks/lit/frag/metalnessModulate.js
  • src/scene/shader-lib/wgsl/chunks/lit/frag/reflectionSheen.js
  • src/scene/shader-lib/wgsl/chunks/lit/frag/spot.js
  • src/scene/shader-lib/wgsl/chunks/particle/frag/particle_blendNormal.js
  • src/scene/shader-lib/wgsl/chunks/particle/frag/particle_lighting.js

Checklist

• I have read the contributing guidelines
• My code follows the project's coding standards
• This PR focuses on a single change

[Copilot]

Pull request overview

This pull request corrects the language annotation comments in WGSL shader chunk files from /* glsl */ to /* wgsl */ to accurately reflect the shader language being used. These comment annotations are typically used by code editors and IDEs for syntax highlighting and language support.

• Updated language annotation comments from /* glsl */ to /* wgsl */ in 7 shader chunk files
• All changes are within the src/scene/shader-lib/wgsl/chunks/ directory
• No functional changes; this is purely a metadata/documentation improvement

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/scene/shader-lib/wgsl/chunks/particle/frag/particle_lighting.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/particle/frag/particle_blendNormal.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/lit/frag/spot.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/lit/frag/reflectionSheen.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/lit/frag/metalnessModulate.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/lit/frag/lighting/shadowPCF3.js	Corrected language annotation from GLSL to WGSL
src/scene/shader-lib/wgsl/chunks/lit/frag/lighting/lightEvaluation.js	Corrected language annotation from GLSL to WGSL

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