feat(编辑能力): 完善复合对象编辑，修复撤销后的粘贴路径和裁剪状态

ofdgo_editor_open.go

@@ -62,13 +62,14 @@ type editorSourcePage struct {
 // Update表示完整替换内容，ReplaceFont表示可显式替换文字字体，Transform表示保留文字定位的几何变换，Order仅限同一图层或末级页块
 // Arrange表示可准确度量对齐与旋转范围；Reflow表示可重排文字，LayoutKnown表示段落选项可恢复
 // Paint表示可独立修改纯色填充和描边，不要求重新排版文字
-// ReplaceImage表示可替换图片数据，内部成员保留原布局，不开放裁剪或重新适应
+// ReplaceImage表示可替换图片数据，CropImage表示可裁剪图片；内部裁剪与原裁剪取交集
 // MissingGlyphs提供缺字导致操作受限时的结构化诊断
 type ObjectCapabilities struct {
 	Update        bool
 	Paint         bool
 	ReplaceFont   bool
 	ReplaceImage  bool
+	CropImage     bool
 	Reflow        bool
 	LayoutKnown   bool
 	Transform     bool
@@ -358,6 +359,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 	origin := e.objectOrigin(id)
 	if origin == nil {
 		all.ReplaceImage = object.Type == "ImageObject"
+		all.CropImage = all.ReplaceImage
 		return all, nil
 	}
 	node := origin.node
@@ -388,6 +390,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 	}
 	all.Paint = all.Paint && e.editorPaintable(object)
 	all.ReplaceImage = all.Update && object.Type == "ImageObject"
+	all.CropImage = all.ReplaceImage
 	if object.Type == "ImageObject" && object.ImageObject.Border != nil && len(object.ImageObject.Actions) != 0 {
 		all.Transform, all.Arrange = false, false
 		all.Reason, all.ReasonCode = "image actions cannot be transformed together with the border", EditUnsupportedObject