In a leafy Tehran park on Thursday, Iranians gathered for picnics on the final day of the Persian new year holidays, shrugging off US President Donald Trump’s threats to bomb Iran “back to the Stone Ages”.The country has been at war for more than a month and Trump – who launched the conflict alongside Israel on February 28 – has vowed to strike Iran hard for another “two or three weeks”.Powerful blasts shook the Iranian capital on Thursday.Still, hundreds of families sat out under mild,...