refactor: Adopt gp_Ax2 for sketch plane and geometry definition

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/ApplicationController.h

@@ -9,8 +9,8 @@
 #define APPLICATIONCONTROLLER_H
 
 #include <QObject>
-#include "ViewportWidget.h" // For SketchPlane enum
 #include <gp_Pnt.hxx>
+#include <gp_Ax2.hxx>
 
 class Document;
 class MainWindow;
@@ -47,12 +47,12 @@ public slots:
     bool saveDocumentAs();
 
     void beginSketchCreation();
-    void onPlaneSelected(ViewportWidget::SketchPlane plane);
+    void onPlaneSelected(const gp_Ax2& plane);
     void endSketch();
 
 signals:
     void planeSelectionModeStarted();
-    void sketchModeStarted(ViewportWidget::SketchPlane plane);
+    void sketchModeStarted(const gp_Ax2& plane);
     void sketchModeEnded();
     void currentFileChanged(const QString& path);
     void activeToolChanged(ToolType tool);