fix: transpose matrices on GPU upload (row-major → column-major)

mini_math mat4 is row-major; WGSL mat4x4f is column-major. Matrices
uploaded without transposing were interpreted as their own transpose on
the GPU, causing RotatingCube and Renderer3D to render upside-down.

- Add gpu_upload_mat4() to post_process_helper for standalone uploads
- Add Uniforms::make() to RotatingCube::Uniforms (handles transpose)
- Add GlobalUniforms::make() and ObjectData::make() to renderer.h
- Update renderer_draw.cc and visual_debug.cc to use make()

handoff(Gemini): matrix layout bug fixed across all rasterized effects.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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