清理无用代码

@@ -1133,7 +1133,7 @@ class DragDropScrollArea(QScrollArea):
             if mime_data.hasImage():
                 image = mime_data.imageData()
                 if isinstance(image, QImage) and not image.isNull():
-                    self.parent_window.add_clipboard_image(image)
+                    self.parent_window.add_clipboard_image(image.copy())
                     event.acceptProposedAction()
                     return
         except Exception:
@@ -1934,13 +1934,13 @@ class ImageGeneratorWindow(QMainWindow):
                         if raw_data and len(raw_data) > 0:
                             image = QImage()
                             if image.loadFromData(raw_data):
-                                return image
+                                return image.copy()
 
                 # 尝试 hasImage + imageData
                 if mime_data.hasImage():
                     image_data = mime_data.imageData()
                     if isinstance(image_data, QImage) and not image_data.isNull():
-                        return image_data
+                        return image_data.copy()
         except Exception as e:
             self.logger.warning(f"MIME data 方式获取剪贴板图像失败: {e}")
 
@@ -1971,7 +1971,7 @@ class ImageGeneratorWindow(QMainWindow):
                 if result.returncode == 0 and temp_path.exists() and temp_path.stat().st_size > 0:
                     image = QImage(str(temp_path))
                     if not image.isNull():
-                        return image
+                        return image.copy()
             except Exception as e:
                 self.logger.warning(f"osascript 方式获取剪贴板图像失败: {e}")
 
@@ -1979,7 +1979,7 @@ class ImageGeneratorWindow(QMainWindow):
         try:
             image = clipboard.image()
             if image and not image.isNull():
-                return image
+                return image.copy()
         except Exception as e:
             self.logger.warning(f"clipboard.image() 失败: {e}")