Ed_ d9148acb0c feat(shader): Add BlurPipeline class for frosted glass FBO setup ...

- Add BlurPipeline class with downsampled FBO support (scene, blur_a, blur_b)
- Implement 2-pass Gaussian blur shaders (horizontal + vertical)
- Add setup_fbos(), compile_blur_shaders(), prepare_blur(), cleanup() methods
- Add tests for BlurPipeline initialization, FBO setup, shader compilation, blur execution, and cleanup

Task: Phase 1, Task 1 of frosted_glass_20260313 track

2026-03-13 20:22:16 -04:00

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