space warp fixes

src/graphics/renderers/GameRenderer.cpp

@@ -716,7 +716,16 @@ void GameRenderer::renderPlayingState(
     SDL_BlendMode oldBlend = SDL_BLENDMODE_NONE;
     SDL_GetRenderDrawBlendMode(renderer, &oldBlend);
     SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
-    s_inGridStarfield.draw(renderer, gridX, gridY, 0.22f, true);
+    // Add a small, smooth sub-pixel jitter to the starfield origin so the
+    // brightest star doesn't permanently sit exactly at the visual center.
+    {
+        const float jitterAmp = 1.6f; // max pixels of jitter
+        const uint32_t now = SDL_GetTicks();
+        const float tms = static_cast<float>(now) * 0.001f;
+        const float jitterX = std::sin(tms * 1.7f) * jitterAmp + std::cos(tms * 0.9f) * 0.4f;
+        const float jitterY = std::sin(tms * 1.1f + 3.7f) * (jitterAmp * 0.6f);
+        s_inGridStarfield.draw(renderer, gridX + jitterX, gridY + jitterY, 0.22f, true);
+    }
 
     // Update and spawn ambient sparkles inside/around the grid
     // Use the same RNG and timing values used for impact sparks