Address PR #814 review feedback: keyboard handling, constant extraction, and error recovery (#816)

* feat: add AI Teaching Assistant component with chat functionality

- Implemented AITeachingAssistant component for interactive AI chat.
- Created API endpoint for chat interactions with AI providers.
- Integrated multiple AI providers (Google Gemini, Azure, OpenAI, Phi-3) with fallback mechanism.
- Added offline fallback script for improved user experience.
- Enhanced user interface with responsive design and error handling.

* Update src/pages/courses/web-development/[moduleId]/[lessonId].tsx

Co-authored-by: Copilot <[email protected]>

* Update src/components/ai-assistant/AITeachingAssistant.tsx

Co-authored-by: Copilot <[email protected]>

* Initial plan

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Co-authored-by: jeromehardaway <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: copilot-swe-agent[bot] <[email protected]>

Author: 3 people