TEL AVIV, Israel — Hezbollah has launched a new weapon against northern Israel in the latest round of fighting : small drones controlled with fiber-optic cables the width of dental floss that avoid electronic detection. These drones — used widely in the war in Ukraine — are small, hard to track and lethal. Drones killed an Israeli soldier in southern Lebanon and injured at least a dozen others in northern Israel on Thursday, two seriously. A soldier and defense contractor were killed in Lebanon