refactor(editor): remove dead marker renderer, clean up stale fields

- Remove markerRenderer_ initialization, shutdown, update, and clear
  calls from EditorViewport (markers replaced by actual M2 rendering)
- Remove unused saveAdtRequested_/saveWdtRequested_ fields and their
  void casts (replaced by unified exportZone workflow)
- Zero warnings across both wowee and wowee_editor targets

tools/editor/editor_ui.hpp

@@ -54,8 +54,6 @@ private:
     bool loadRequested_ = false;
 
     char savePathBuf_[512] = "";
-    bool saveAdtRequested_ = false;
-    bool saveWdtRequested_ = false;
 
     // Paint panel
     PaintMode paintMode_ = PaintMode::Paint;