Most Gulf stock markets ended lower on Wednesday as fighting between Yemen's Iran-aligned Houthis and Saudi-backed government forces intensified on several fronts.Saudi-backed Yemeni government forces are pushing a major offensive to retake ground lost to weeks of Houthi advances, backed by stepped-up Saudi air strikes.The Houthis struck Aden International Airport on Wednesday with ballistic missiles and explosive drones, Yemen's Transport Ministry said, marking a sharp escalation…