refactor(wgsl): modularize common shader functions

Extracted common WGSL functions into separate files in `common/shaders/` to improve reusability and maintainability.

- Created `common/shaders/render/fullscreen_vs.wgsl` for a reusable fullscreen vertex shader.
- Created `common/shaders/math/color.wgsl` for color conversion and tone mapping functions.
- Created `common/shaders/math/utils.wgsl` for general math utilities.
- Created `common/shaders/render/raymarching.wgsl` for SDF raymarching logic.
- Updated multiple shaders to use these new common snippets via `#include`.
- Fixed the shader asset validation test to correctly handle shaders that include the common vertex shader.

This refactoring makes the shader code more modular and easier to manage.

1 files changed, 4 insertions, 0 deletions

diff --git a/workspaces/test/assets.txt b/workspaces/test/assets.txt
index ed81885..b717e15 100644
--- a/workspaces/test/assets.txt
+++ b/workspaces/test/assets.txt
@@ -54,6 +54,10 @@ SHADER_RENDER_LIGHTING_UTILS, NONE, ../../common/shaders/render/lighting_utils.w
 SHADER_MESH, NONE, shaders/mesh_render.wgsl, "Mesh Rasterization Shader"
 MESH_CUBE, NONE, obj/test_mesh.obj, "A simple cube mesh"
 DODECAHEDRON, NONE, obj/dodecahedron.obj, "A dodecahedron mesh"
+SHADER_RENDER_FULLSCREEN_VS, NONE, ../../common/shaders/render/fullscreen_vs.wgsl, "Fullscreen Vertex Shader"
+SHADER_MATH_COLOR, NONE, ../../common/shaders/math/color.wgsl, "Color Functions"
+SHADER_MATH_UTILS, NONE, ../../common/shaders/math/utils.wgsl, "Math Utilities"
+SHADER_RENDER_RAYMARCHING, NONE, ../../common/shaders/render/raymarching.wgsl, "Raymarching Functions"
 SHADER_VIGNETTE, NONE, shaders/vignette.wgsl, "Vignette Shader"
 SHADER_COMPUTE_GEN_NOISE, NONE, ../../common/shaders/compute/gen_noise.wgsl, "GPU Noise Compute Shader"
 SHADER_COMPUTE_GEN_PERLIN, NONE, ../../common/shaders/compute/gen_perlin.wgsl, "GPU Perlin Noise Compute Shader"