Adds a self-contained browser playground (editor + canvas + console + REPL)
around the Emscripten WebGPU build, plus the engine fixes required to render:
- JS<->Squirrel bridge (apply/eval/read/pause) and Emscripten 6 exports
- soft hot-reload via load.nut handle_change with __pg state preservation
- fix Uint16 index buffer byte sizes in SetIndexBuffer calls
- fix dangling GbufferSlot/SceneColorSlot gpuHandle pointers (std::move bug)
- fallback shadow depth texture when no shadow map is configured
- fix WGSL syntax (mod/ivec2) and default shadow sampler maxAnisotropy
- serve_webgpu.py COOP/COEP server and playground docs/demos/assets
Replace the bouncing-squares demo with a 48x24 lit sphere that rotates around Y, exercising the offscreen scene-color pass, mesh3D shader, and swapchain compositing path that was just fixed.
- Added support for the WebGPU backend in the CMake configuration, enabling builds for Emscripten and native Dawn.
- Implemented conditional compilation for WebGPU-specific features, including shader management and file system handling.
- Updated the build process to exclude unnecessary modules and dependencies for WebGPU, optimizing the engine for browser environments.
- Enhanced the installation script to include WebGPU-related files and directories in the output.
- Refactored existing modules to accommodate WebGPU, ensuring compatibility and performance improvements across the engine.
- Introduced new compile options and configurations tailored for WebGPU builds, including handling of third-party libraries and assets.
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