refactor(gpu): Add RAII wrapper for WGPU resources to eliminate manual cleanup

Introduces WGPUResource template with automatic release on destruction.
Reduces boilerplate in effect destructors and prevents resource leaks.

- set() for one-time initialization
- replace() for per-frame recreation
- Field ordering documented for dependency management

Converted 3 effects (Heptagon, Flash, Passthrough) and Effect base class.
All tests pass (34/34).

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

1 files changed, 4 insertions, 4 deletions

diff --git a/src/gpu/effect.cc b/src/gpu/effect.cc
index cd4bc16..d0693ec 100644
--- a/src/gpu/effect.cc
+++ b/src/gpu/effect.cc
@@ -62,15 +62,15 @@ void Effect::init_uniforms_buffer() {
 }
 
 void Effect::create_linear_sampler() {
-  sampler_ = gpu_create_linear_sampler(ctx_.device);
+  sampler_.set(gpu_create_linear_sampler(ctx_.device));
 }
 
 void Effect::create_nearest_sampler() {
-  sampler_ = gpu_create_nearest_sampler(ctx_.device);
+  sampler_.set(gpu_create_nearest_sampler(ctx_.device));
 }
 
 void Effect::create_dummy_scene_texture() {
   TextureWithView dummy = gpu_create_dummy_scene_texture(ctx_.device);
-  dummy_texture_ = dummy.texture;
-  dummy_texture_view_ = dummy.view;
+  dummy_texture_.set(dummy.texture);
+  dummy_texture_view_.set(dummy.view);
 }