Show HN: PhysicsAI.chat – step-by-step physics solver with diagrams (physicsai.chat)

I built PhysicsAI.chat to help students get step-by-step reasoning (not only final answers). It supports photo problems and tries to show clear derivations + units checks. I’d love feedback on: (1) explanation clarity, (2) wrong-answer failure modes, (3) what would make you trust it more.