refactor: Move camera mouse event handling to Camera class

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

src/Camera.h

@@ -19,8 +19,9 @@ class Camera : public QObject
 public:
     explicit Camera(QObject *parent = nullptr);
 
-    void processMouseMovement(QMouseEvent* event, const QPoint& lastPos);
-    void processWheel(QWheelEvent* event);
+    void mousePressEvent(QMouseEvent* event);
+    void mouseMoveEvent(QMouseEvent* event);
+    void wheelEvent(QWheelEvent* event);
 
     QMatrix4x4 modelViewMatrix() const;
 
@@ -52,6 +53,7 @@ signals:
     void restoreStateAnimationFinished();
 
 private:
+    QPoint m_lastPos;
     float m_xRot;
     float m_yRot;
     float m_zoom;