Fix FN_URL in podcast.ts to use runtime config

Fix URL mismatch between Auth and Edge Functions

style: remove width constraints to allow full-width notes

style: increase width of notes area to max-w-6xl

feat: adopt Clean Professional (Turbo AI) style for notes

feat: enforce Heading-First Expansion to prevent list grouping

feat: implement Strict Zero-Simplification Policy for Expert Agent

feat: Expert Academic Data Extraction Agent upgrade with parallel OCR and premium UI

fix: implement runtime environment variable injection for Hugging Face

fix: resolve Hugging Face deployment and environment variable issues

Deploy: OCR support for PDF/Images/DOCX