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, 3 insertions, 3 deletions

diff --git a/src/tests/assets/test_sequence.cc b/src/tests/assets/test_sequence.cc
index edf5c2d..445e44b 100644
--- a/src/tests/assets/test_sequence.cc
+++ b/src/tests/assets/test_sequence.cc
@@ -42,13 +42,13 @@ class DummyEffect : public Effect {
     ++start_calls;
   }
   void render(WGPURenderPassEncoder pass,
-              const CommonPostProcessUniforms& uniforms) override {
+              const UniformsSequenceParams& uniforms) override {
     ++render_calls;
     (void)pass;
     (void)uniforms;
   }
   void compute(WGPUCommandEncoder encoder,
-               const CommonPostProcessUniforms& uniforms) override {
+               const UniformsSequenceParams& uniforms) override {
     (void)encoder;
     (void)uniforms;
   }
@@ -75,7 +75,7 @@ class DummyPostProcessEffect : public PostProcessEffect {
     (void)demo;
   }
   void render(WGPURenderPassEncoder pass,
-              const CommonPostProcessUniforms& uniforms) override {
+              const UniformsSequenceParams& uniforms) override {
     ++render_calls;
     (void)pass;
     (void)uniforms;