refactor: Move camera mouse event handling to Camera class

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

src/ViewportWidget.cpp

@@ -191,6 +191,8 @@ void ViewportWidget::resizeGL(int w, int h)
 
 void ViewportWidget::mousePressEvent(QMouseEvent *event)
 {
+    m_camera->mousePressEvent(event);
+
     if (event->button() == Qt::LeftButton) {
         if (m_isSelectingPlane) {
             if (m_highlightedPlane != SketchPlane::NONE) {
@@ -208,8 +210,6 @@ void ViewportWidget::mousePressEvent(QMouseEvent *event)
             return;
         }
 
-    } else {
-        lastPos = event->pos();
     }
 }
 
@@ -233,16 +233,13 @@ void ViewportWidget::mouseMoveEvent(QMouseEvent *event)
         m_activeSketchTool->mouseMoveEvent(event);
     }
 
-    if (event->buttons() & Qt::MiddleButton) {
-        m_camera->processMouseMovement(event, lastPos);
-    }
-    lastPos = event->pos();
+    m_camera->mouseMoveEvent(event);
     update();
 }
 
 void ViewportWidget::wheelEvent(QWheelEvent *event)
 {
-    m_camera->processWheel(event);
+    m_camera->wheelEvent(event);
 }
 
 void ViewportWidget::keyPressEvent(QKeyEvent *event)