Data: Gallup; Chart: Danielle Alberti/Axios AI tools are reshaping the classroom and students' critical thinking — but school leaders are lagging on giving teachers formal guidance for using the tech, a new report shows. The big picture: AI should amplify the best parts of the classroom and streamline work for already stressed teachers, education experts tell Axios — not create an added burden for educators or replace human connection. "AI is out there," All4Ed CEO Amy Loyd tells Axios. "It's not a question of whether or not our students are going to be using it; it's a question of how well our educators are supported and receive the ongoing professional learning and capacity building to be able to be confident in it." A growing share of K-12 students already expect they'll have to know how to use AI in college, and the tech is already making college students change majors.…