By Laila Bassam, Maya Gebeily and Maayan LubellBEIRUT, March 5 (Reuters) - Lebanese armed group Hezbollah spent months restocking its arsenal of rockets and drones, using support from Iran and its own weapons factories to prepare for a new war with Israel, six sources familiar with the group's preparations said.Down but not out after its devastating 2024 conflict with Israel, Hezbollah had concluded that another round of fighting was inevitable - and that this time, it could face an existential...