feat: full-height libraries, pre-generated reward image, English upload text

fix: library panels full width, hidden rows off-screen

feat: full-height library side panels with animated robots

feat: animated library side panels with mini robots

feat: amphitheater hero with mouse-tracking robot professor, fixed particles

feat: FLUX image generation moved to End Session modal as session visual summary

feat: FLUX.1-schnell image generation after correct answers

ui: replace mode pills with large cards (icon, title, desc, check indicator)

remove: source passage section and Open Q/MCQ mode toggle from UI

fix: English only, remove language toggle

fix: MCQ onclick via closure, add FR/EN language pills wired to hidden textbox

feat: add MCQ mode with 4 options, client-side evaluation and per-choice explanations

fix: full quiz flow via BRIDGE_JS, English only, buttons DOM-visible

fix: hero HTML fragment, invisible textboxes, gradient button

feat: hybrid approach native Gradio file upload styled with custom CSS

feat: Off-Brand badge - custom FastAPI+HTML frontend, zero Gradio chrome