refactor: Move sketch mode camera animations to Camera class

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

src/Camera.h

@@ -38,6 +38,9 @@ public:
     void saveState();
     void restoreState();
 
+    void animateToPlaneView(int plane);
+    void animateRestoreState();
+
     float savedXRot() const { return m_savedXRot; }
     float savedYRot() const { return m_savedYRot; }
     float savedZoom() const { return m_savedZoom; }
@@ -46,6 +49,7 @@ public:
 
 signals:
     void cameraChanged();
+    void restoreStateAnimationFinished();
 
 private:
     float m_xRot;