Add image selection refinement functionality with BEN2 integration

- Implemented viewport.py for handling 3D view projections, gestures, and overlay drawing.
- Created refine_image_selection.py to manage the refinement of gesture masks and output image bounds.
- Added selection module with refine_selection.py to process and crop images based on alpha channel visibility.
- Introduced __init__.py for selection module to expose refine_selection function.

docs/internals/operators/perspective-tool.md

@@ -23,7 +23,7 @@ flowchart TD
 
 `operators/perspective_tool/__init__.py` 导出注册类型，交互和计算集中在 `edit_perspective.py`。`ImagePerspectiveTool` 启动 `EditImagePerspective`，后者接受任意顺序的四个图片角点，再根据源图 X/Y 方向整理成不交错的凸 Quad。
 
-图片坐标投射和首次点击选择复用 `common/image_interaction.py`。四个角点在该流程中统一表示为 Quad。
+图片坐标投射和首次点击选择复用 `common/viewport.py`。四个角点在该流程中统一表示为 Quad。
 
 ### 预览并调整比例
 
@@ -37,4 +37,4 @@ flowchart TD
 
 ### 裁切并写回
 
-Warp 结果按可见 Alpha 紧裁切，再通过 `common/image_data.py` 创建 Packed Image 并替换当前 Empty。写回时保持中心和覆盖尺度近似一致。
+Warp 结果按可见 Alpha 紧裁切，再通过 `common/image.py` 创建 Packed Image 并替换当前 Empty。写回时保持中心和覆盖尺度近似一致。