refactor: Store const GpuContext& in Effect base class

- Changed Effect to store ctx_ reference instead of device_/queue_/format_
- Updated all 19 effect implementations to access ctx_.device/queue/format
- Simplified Effect constructor: ctx_(ctx) vs device_(ctx.device), queue_(ctx.queue), format_(ctx.format)
- All 28 tests pass, all targets build successfully

1 files changed, 2 insertions, 4 deletions

diff --git a/src/gpu/effect.h b/src/gpu/effect.h
index 006ee6f..725c020 100644
--- a/src/gpu/effect.h
+++ b/src/gpu/effect.h
@@ -9,7 +9,7 @@ class PostProcessEffect;
 
 class Effect {
  public:
-  Effect(const GpuContext& ctx) : device_(ctx.device), queue_(ctx.queue), format_(ctx.format) {
+  Effect(const GpuContext& ctx) : ctx_(ctx) {
   }
   virtual ~Effect() = default;
   virtual void init(MainSequence* demo) {
@@ -40,9 +40,7 @@ class Effect {
   }
 
  protected:
-  WGPUDevice device_;
-  WGPUQueue queue_;
-  WGPUTextureFormat format_;
+  const GpuContext& ctx_;
   GpuBuffer uniforms_;
   int width_ = 1280;
   int height_ = 720;