fix: Rename camera state members to avoid name conflicts

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

src/ViewportWidget.h

@@ -72,11 +72,11 @@ private:
     FeatureBrowser* m_featureBrowser = nullptr;
     SketchPlane m_currentPlane = SketchPlane::NONE;
 
-    float xRot = 0;
-    float yRot = 0;
-    float zoom = -5.0f;
-    float panX = 0;
-    float panY = 0;
+    float m_xRot = 0;
+    float m_yRot = 0;
+    float m_zoom = -5.0f;
+    float m_panX = 0;
+    float m_panY = 0;
     QPoint lastPos;
 
     float m_savedXRot = 0;