fix: patch gradio schema and matplotlib backend, add e2e test

fix: handle utf-16 curve files and validate loaded curves

fix(ui): use list_papers() instead of get_all() in paper profiles dropdown

fix: Add compatibility aliases for Gradio UI paper database calls

fix: Address PR review feedback - improve logging, fix tests, remove unused code

feat: Add comprehensive feature set for Pt/Pd printing workflow

feat: Add image preview, digital negative export, and interactive curve editor

feat: Add chemistry calculator and runtime API key settings

feat: Add comprehensive curve display and step wedge analysis features

feat: Implement initial PTPD calibration system with modular configuration, LLM client, curve processing, Gradio UI, and a comprehensive test suite.

fix: Improve curve editor with multi-channel support and dynamic updates

feat: Add .quad file upload, curve modification, and AI enhancement

feat: Implement AI-powered Pt/Pd calibration system