refactor: replace standard logging with a centralized loguru configuration and interception handler

feat: implement LLM fallback for quiz generation and enhance OAuth error handling

refactor: update system prompts safety guidelines

refactor: add NSFW and gibbreish words filtering

feat: introduce robust web-based prompt templates for quizzes and summaries.

refactor: changing to gemini model, modularize constants and schemas and update user daily generation limit

feat: enforce user ownership verification for material access across all API routes

fix: improve security, session handling, and UI responsiveness for topic management and document rendering

feat: disable renaming for topics and transition to per-user title uniqueness constraints

refactor: implement async execution for blocking database operations and add title collision auto-increment for new materials

feat: implement centralized token extraction via Request headers and add debug logging to search route

fix: fixing search endpoint

feat: implement daily request rate limiting with per-user usage tracking and admin bypass

feat: implement search functionality, add background task queue logic for title conflicts, and enhance auth state synchronization

feat: Adding Parallel Processing and enhance main dashboard, summary and chat styles

feat: implement async quiz generation, add quiz result persistence, and integrate Supabase authentication

feat: implement authentication system, add quiz history support, and update API endpoints for material and tutor interactions

feat: migrate UI to Next.js with extensive component library and integrate Hugging Face deployment workflow

refactor: restructure project into modular src architecture and implement database store layer