fix: calculate beat_phase for FlashEffect and refactor uniforms

- seq_compiler.py: Calculate beat_phase from beat_time (was hardcoded 0.0f)
- Refactor: Replace CommonPostProcessUniforms with UniformsSequenceParams
- Remove duplicate struct definition in post_process_helper.h
- Update all CNN effects and tests to use unified uniform struct
- Fixes FlashEffect showing solid white instead of flashing to beat

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/cnn_v2/src/cnn_v2_effect.h b/cnn_v2/src/cnn_v2_effect.h
index 7960b4f..b675736 100644
--- a/cnn_v2/src/cnn_v2_effect.h
+++ b/cnn_v2/src/cnn_v2_effect.h
@@ -19,9 +19,9 @@ class CNNv2Effect : public PostProcessEffect {
   void init(MainSequence* demo) override;
   void resize(int width, int height) override;
   void compute(WGPUCommandEncoder encoder,
-               const CommonPostProcessUniforms& uniforms) override;
+               const UniformsSequenceParams& uniforms) override;
   void render(WGPURenderPassEncoder pass,
-              const CommonPostProcessUniforms& uniforms) override;
+              const UniformsSequenceParams& uniforms) override;
   void update_bind_group(WGPUTextureView input_view) override;
 
   void set_beat_modulation(bool enabled, float scale = 1.0f) {