updated sync line

src/graphics/renderers/SyncLineRenderer.h

@@ -1,6 +1,8 @@
 #pragma once
 #include <SDL3/SDL.h>
 
+#include <vector>
+
 enum class SyncState {
     Idle,
     LeftReady,
@@ -21,13 +23,27 @@ public:
     void Render(SDL_Renderer* renderer);
 
 private:
+    struct SyncParticle {
+        float y;
+        float speed;
+        float alpha;
+    };
+
     SDL_FRect m_rect{};
     SyncState m_state;
 
     float m_flashTimer;
     float m_time;
 
+    float m_pulseTime{0.0f};
+    float m_spawnAcc{0.0f};
+    std::vector<SyncParticle> m_particles;
+
     static constexpr float FLASH_DURATION = 0.15f;
+    static constexpr size_t MAX_PARTICLES = 64;
+
+    void SpawnParticle();
+    void SpawnBurst(int count);
 
     SDL_Color GetBaseColor() const;
 };