Fix: Handle missing Streamlit secrets in production using environment variables.

Add Gemini Chat feature, fix paper classification, refine section extraction, and improve UI visibility.

Delete PROJECT_CHECKLIST.md

Delete fix_indent.py

Delete test_adv.py

Delete test_new_features.py

Code Cleanup

Docs: Add comprehensive README.md

UI/UX redesign: vibrant gradients, dark sidebar, hero section, pill navigation, collapsible sidebar

Fix KeyError in compare papers due to sqlite3.Row not having .get method

Add new features: plagiarism detection, export to DOCX/LaTeX, future research suggestions, and advanced ML analysis

fix: remove trailing whitespace and ensure clean indentation

fix: resolve IndentationError in app/main.py

Delete TASKS.md

fix: correct Dockerfile for NLP corpus installation and persistent NLTK_DATA