updated stars in game play grid

src/graphics/renderers/GameRenderer.cpp

@@ -265,6 +265,39 @@ void GameRenderer::renderPlayingState(
     const float deltaSeconds = std::clamp(static_cast<float>(sparkDeltaMs) / 1000.0f, 0.0f, 0.033f);
     s_inGridStarfield.update(deltaSeconds);
 
+    bool appliedMagnet = false;
+    if (game) {
+        const Game::Piece& activePiece = game->current();
+        const int pieceType = static_cast<int>(activePiece.type);
+        if (pieceType >= 0 && pieceType < PIECE_COUNT) {
+            float sumLocalX = 0.0f;
+            float sumLocalY = 0.0f;
+            int filledCells = 0;
+            for (int cy = 0; cy < 4; ++cy) {
+                for (int cx = 0; cx < 4; ++cx) {
+                    if (!Game::cellFilled(activePiece, cx, cy)) {
+                        continue;
+                    }
+                    sumLocalX += (activePiece.x + cx + 0.5f) * finalBlockSize;
+                    sumLocalY += (activePiece.y + cy + 0.5f) * finalBlockSize;
+                    ++filledCells;
+                }
+            }
+            if (filledCells > 0) {
+                float magnetLocalX = sumLocalX / static_cast<float>(filledCells);
+                float magnetLocalY = sumLocalY / static_cast<float>(filledCells);
+                magnetLocalX = std::clamp(magnetLocalX, 0.0f, GRID_W);
+                magnetLocalY = std::clamp(magnetLocalY, 0.0f, GRID_H);
+                const float magnetStrength = finalBlockSize * 2.2f;
+                s_inGridStarfield.setMagnetTarget(magnetLocalX, magnetLocalY, magnetStrength);
+                appliedMagnet = true;
+            }
+        }
+    }
+    if (!appliedMagnet) {
+        s_inGridStarfield.clearMagnetTarget();
+    }
+
     SDL_BlendMode oldBlend = SDL_BLENDMODE_NONE;
     SDL_GetRenderDrawBlendMode(renderer, &oldBlend);
     SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);