refactor: Bundle GPU context into GpuContext struct

- Created GpuContext struct {device, queue, format}
- Updated Effect/PostProcessEffect to take const GpuContext&
- Updated all 19 effect implementations
- Updated MainSequence.init() and LoadTimeline() signatures
- Updated generated timeline files
- Updated all test files
- Added gpu_get_context() accessor and fixture.ctx() helper

Fixes test_mesh.cc compilation error from g_device/g_queue/g_format conflicts.
All targets build successfully.

1 files changed, 4 insertions, 6 deletions

diff --git a/src/gpu/effects/flash_cube_effect.cc b/src/gpu/effects/flash_cube_effect.cc
index 75c71e1..4f58562 100644
--- a/src/gpu/effects/flash_cube_effect.cc
+++ b/src/gpu/effects/flash_cube_effect.cc
@@ -8,10 +8,8 @@
 #include <cmath>
 #include <iostream>
 
-FlashCubeEffect::FlashCubeEffect(WGPUDevice device, WGPUQueue queue,
-                                 WGPUTextureFormat format)
-    : Effect(device, queue) {
-  (void)format;
+FlashCubeEffect::FlashCubeEffect(const GpuContext& ctx)
+    : Effect(ctx) {
 }
 
 void FlashCubeEffect::resize(int width, int height) {
@@ -22,9 +20,9 @@ void FlashCubeEffect::resize(int width, int height) {
 
 void FlashCubeEffect::init(MainSequence* demo) {
   (void)demo;
-  WGPUTextureFormat format = demo->format;
+  WGPUTextureFormat format = demo->gpu_ctx.format;
 
-  renderer_.init(device_, queue_, format);
+  renderer_.init(device_, queue_, format_);
   renderer_.resize(width_, height_);
 
   // Texture Manager