feat: Add animated home button to view cube to reset camera

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

src/ViewportWidget.cpp

@@ -202,6 +202,7 @@ void ViewportWidget::paintGL()
         m_sketchGrid->paintAxisLabels(painter, static_cast<SketchGrid::SketchPlane>(m_currentPlane), model, projection);
     }
     m_featureBrowser->paint(painter, width(), height());
+    m_viewCube->paint2D(painter, width(), height());
 
 
     if (m_activeSketchTool) {
@@ -230,6 +231,12 @@ void ViewportWidget::mousePressEvent(QMouseEvent *event)
     }
 
     if (event->button() == Qt::LeftButton) {
+        if (m_viewCube->handleMousePress(event->pos(), width(), height())) {
+            m_camera->animateToHomeView();
+            update();
+            return;
+        }
+
         if (m_isSelectingPlane) {
             if (m_highlightedPlane != SketchPlane::NONE) {
                 emit planeSelected(m_highlightedPlane);