NIDAL AL-MUGHRABI and DAN WILLIAMS AN Egyptian-mediated truce between Israel and Hamas took hold today after the worst violence in years, with U.S. President Joe Biden pledging to salvage the devastated Gaza Strip and the United Nations urging renewed Israeli-Palestinian dialogue. Israeli aerial bombardment of the densely populated enclave killed 232 Palestinians, damaged thousands of homes and disabled critical infrastructure. Gaza rocket attacks killed 12 people in Israel and wounded hundreds. Palestinians who had spent 11 days huddled in fear of Israeli shelling poured into Gaza's streets, embracing one another in celebration in front of bombed out buildings and along…