What's new
- Added a checkbox to keep (or not keep) each layer's original position on the canvas.
- Enabled (default): PNG matches full canvas size, layer placed at its original position (same as before).
- Disabled: PNG is cropped to the layer's own bounding box.
新增「保留圖層在畫布中的原始位置」勾選項：
- 開啟（預設）：PNG 與畫布等大，圖層位置完整保留（與先前行為相同）。
- 關閉：PNG 依圖層自身範圍裁切匯出。