By bne Tehran bureau The disappearance of President Ebrahim Raisi following a helicopter crash at the age of 63 has sent shockwaves through Iran, a nation already grappling with economic woes, international sanctions, and internal unrest from years of government-led oppression. According to the Iranian constitution, the mantle of leadership now falls to the first vice president, currently Mohammad Mokhber. However, his ascent to the presidency is contingent upon the approval of Supreme Leader Ayatollah Ali Khamenei. This sudden shift in leadership highlights the unique structure of Iran’s poli…