OmniActor: A Generalist GUI and Embodied Agent for 2D&3D Worlds - Yang, Longrong; Zeng, Zhixiong; Zhong, Yufeng; Huang, Jing; Zheng, Liming; Chen, Lei; Qiu, Haibo; Qin, Zequn; Ma, Lin; Li, Xi (International Conference on Learning Representations, 2026)