feat(particles): Implement transparent circular particles with alpha blending (Task #53)

## Visual Improvements
- Particles now render as smooth fading circles instead of squares
- Added UV coordinates to vertex shader output
- Fragment shader applies circular falloff (smoothstep 1.0 to 0.5)
- Lifetime-based fade: alpha multiplied by particle.pos.w (1.0 → 0.0)

## Pipeline Changes
- Enabled alpha blending for particle shaders (auto-detected via strstr)
- Blend mode: SrcAlpha + OneMinusSrcAlpha (standard alpha blending)
- Alpha channel: One + OneMinusSrcAlpha for proper compositing

## Demo Integration
- Added 5 ParticleSprayEffect instances at key moments (6b, 12b, 17b, 24b, 56b)
- Increased particle presence throughout demo
- Particles now more visually impactful with transparency

## Files Modified
- assets/final/shaders/particle_render.wgsl: Circular fade logic
- src/gpu/gpu.cc: Auto-enable blending for particle shaders
- assets/demo.seq: Added ParticleSprayEffect at multiple sequences

## Testing
- All 23 tests pass (100%)
- Verified with demo64k visual inspection

3 files changed, 152 insertions, 89 deletions

diff --git a/src/generated/assets_data.cc b/src/generated/assets_data.cc
index 3498e18..1ad54a9 100644
--- a/src/generated/assets_data.cc
+++ b/src/generated/assets_data.cc
@@ -370328,7 +370328,7 @@ alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_COMPUTE[] = {
     0x20, 0x20, 0x20, 0x70, 0x61, 0x72, 0x74, 0x69, 0x63, 0x6c, 0x65, 0x73, 
     0x5b, 0x69, 0x5d, 0x20, 0x3d, 0x20, 0x70, 0x3b, 0x0a, 0x7d, 0x0a, 0x00
 };
-const size_t ASSET_SIZE_SHADER_PARTICLE_RENDER = 1296;
+const size_t ASSET_SIZE_SHADER_PARTICLE_RENDER = 1825;
 alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_RENDER[] = {
     0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x20, 0x50, 0x61, 0x72, 0x74, 0x69, 
     0x63, 0x6c, 0x65, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x70, 0x6f, 
@@ -370364,81 +370364,125 @@ alignas(16) static const uint8_t ASSET_DATA_SHADER_PARTICLE_RENDER[] = {
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+    0x20, 0x76, 0x65, 0x63, 0x34, 0x3c, 0x66, 0x33, 0x32, 0x3e, 0x28, 0x63, 
+    0x6f, 0x6c, 0x6f, 0x72, 0x2e, 0x72, 0x67, 0x62, 0x2c, 0x20, 0x63, 0x6f, 
+    0x6c, 0x6f, 0x72, 0x2e, 0x61, 0x20, 0x2a, 0x20, 0x63, 0x69, 0x72, 0x63, 
+    0x6c, 0x65, 0x5f, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x29, 0x3b, 0x0a, 0x7d, 
+    0x0a, 0x00
 };
 const size_t ASSET_SIZE_SHADER_PASSTHROUGH = 665;
 alignas(16) static const uint8_t ASSET_DATA_SHADER_PASSTHROUGH[] = {
diff --git a/src/generated/timeline.cc b/src/generated/timeline.cc
index 0b69b09..cd03b77 100644
--- a/src/generated/timeline.cc
+++ b/src/generated/timeline.cc
@@ -48,9 +48,10 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG
     seq->add_effect(std::make_shared<ThemeModulationEffect>(device, queue, format), 0.000000f, 4.000000f, 0);
     seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.2f, 2.0f, 0);
     seq->add_effect(std::make_shared<Hybrid3DEffect>(device, queue, format), 0.000000f, 2.000000f, 1);
-    seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.000000f, 8.000000f, 2);
-    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 8.000000f, 3);
-    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 4);
+    seq->add_effect(std::make_shared<ParticleSprayEffect>(device, queue, format), 0.000000f, 4.000000f, 2);
+    seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.000000f, 8.000000f, 3);
+    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 8.000000f, 4);
+    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 5);
     main_seq.add_sequence(seq, 28.000000f, 0);
   }
   {
@@ -61,25 +62,28 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG
   }
   {
     auto seq = std::make_shared<Sequence>();
-    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 0);
-    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 0);
+    seq->add_effect(std::make_shared<ParticleSprayEffect>(device, queue, format), 0.000000f, 2.000000f, 0);
+    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 1);
+    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 1);
     main_seq.add_sequence(seq, 3.000000f, 1);
   }
   {
     auto seq = std::make_shared<Sequence>();
     seq->add_effect(std::make_shared<ThemeModulationEffect>(device, queue, format), 0.000000f, 4.000000f, 0);
     seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.2f, 2.0f, 1);
-    seq->add_effect(std::make_shared<Hybrid3DEffect>(device, queue, format), 0.000000f, 10.000000f, 2);
-    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 3);
-    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 5.000000f, 4);
-    seq->add_effect(std::make_shared<SolarizeEffect>(device, queue, format), 0.000000f, 5.000000f, 5);
+    seq->add_effect(std::make_shared<ParticleSprayEffect>(device, queue, format), 0.000000f, 4.000000f, 2);
+    seq->add_effect(std::make_shared<Hybrid3DEffect>(device, queue, format), 0.000000f, 10.000000f, 3);
+    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 4);
+    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 5.000000f, 5);
+    seq->add_effect(std::make_shared<SolarizeEffect>(device, queue, format), 0.000000f, 5.000000f, 6);
     main_seq.add_sequence(seq, 12.000000f, 1);
   }
   {
     auto seq = std::make_shared<Sequence>();
     seq->add_effect(std::make_shared<FlashCubeEffect>(device, queue, format), .2f, 1.500000f, -1);
     seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.000000f, 2.000000f, 0);
-    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 1);
+    seq->add_effect(std::make_shared<ParticleSprayEffect>(device, queue, format), 0.000000f, 2.000000f, 1);
+    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 2);
     main_seq.add_sequence(seq, 6.000000f, 2);
   }
   {
@@ -92,10 +96,11 @@ void LoadTimeline(MainSequence& main_seq, WGPUDevice device, WGPUQueue queue, WG
     auto seq = std::make_shared<Sequence>();
     seq->add_effect(std::make_shared<ThemeModulationEffect>(device, queue, format), 0.000000f, 2.000000f, 0);
     seq->add_effect(std::make_shared<HeptagonEffect>(device, queue, format), 0.2f, 2.0f, 1);
-    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 1);
-    seq->add_effect(std::make_shared<Hybrid3DEffect>(device, queue, format), 0.000000f, 2.000000f, 2);
-    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 3);
-    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 3.000000f, 4);
+    seq->add_effect(std::make_shared<ParticleSprayEffect>(device, queue, format), 0.000000f, 2.000000f, 2);
+    seq->add_effect(std::make_shared<ParticlesEffect>(device, queue, format), 0.000000f, 2.000000f, 2);
+    seq->add_effect(std::make_shared<Hybrid3DEffect>(device, queue, format), 0.000000f, 2.000000f, 3);
+    seq->add_effect(std::make_shared<GaussianBlurEffect>(device, queue, format), 0.000000f, 4.000000f, 4);
+    seq->add_effect(std::make_shared<ChromaAberrationEffect>(device, queue, format), 0.000000f, 3.000000f, 5);
     main_seq.add_sequence(seq, 8.500000f, 2);
   }
   {
diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 1f71711..1d661c7 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -105,9 +105,23 @@ RenderPass gpu_create_render_pass(WGPUDevice device, WGPUTextureFormat format,
   WGPUColorTargetState color_target = {};
   color_target.format = format; // Use passed format
   color_target.writeMask = WGPUColorWriteMask_All;
-  color_target.blend = nullptr;
 
-  // Add additive blending for particles
+  // Enable alpha blending for transparent effects (particles)
+  // Check if shader contains "particle" to enable blending
+  WGPUBlendState blend_state = {};
+  blend_state.color.srcFactor = WGPUBlendFactor_SrcAlpha;
+  blend_state.color.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha;
+  blend_state.color.operation = WGPUBlendOperation_Add;
+  blend_state.alpha.srcFactor = WGPUBlendFactor_One;
+  blend_state.alpha.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha;
+  blend_state.alpha.operation = WGPUBlendOperation_Add;
+
+  // Enable blending for particle shaders
+  if (strstr(shader_code, "particle") != nullptr) {
+    color_target.blend = &blend_state;
+  } else {
+    color_target.blend = nullptr;
+  }
 
   WGPUFragmentState fragment_state = {};
   fragment_state.module = shader_module;