space warp fixes

src/graphics/effects/Starfield3D.cpp

@@ -163,14 +163,22 @@ void Starfield3D::drawStar(SDL_Renderer* renderer, float x, float y, SDL_Color c
 }
 
 void Starfield3D::draw(SDL_Renderer* renderer, float offsetX, float offsetY, float alphaScale, bool grayscale) {
+    // Small visual jitter applied to the visual center so a single bright star
+    // doesn't remain perfectly fixed at the exact pixel center of the viewport.
+    const float jitterAmp = 1.6f; // max pixel offset
+    const uint32_t now = SDL_GetTicks();
+    const float tms = static_cast<float>(now) * 0.001f;
+    const float centerJitterX = std::sin(tms * 1.7f) * jitterAmp + std::cos(tms * 0.9f) * 0.4f;
+    const float centerJitterY = std::sin(tms * 1.1f + 3.7f) * (jitterAmp * 0.6f);
+
     const bool useMagnet = magnetActive && magnetStrength > 0.0f;
     for (const Star3D& star : stars) {
         // Calculate perspective projection factor
         const float k = DEPTH_FACTOR / star.z;
         
         // Calculate screen position with perspective
-        float px = star.x * k + centerX;
-        float py = star.y * k + centerY;
+        float px = star.x * k + centerX + centerJitterX;
+        float py = star.y * k + centerY + centerJitterY;
 
         if (useMagnet) {
             float dx = magnetX - px;