[Feature] Implemented "Generate Quiz from YouTube Video" Context Menu

[yatikakain]

Description

This PR introduces a new feature that allows users to generate quizzes from YouTube videos by extracting their transcripts. The implementation includes:

• Context Menu Integration: A new context menu option appears when right-clicking on YouTube video pages.
• Transcript Extraction: A new API endpoint (/getTranscript) has been added in server.py to fetch video transcripts using yt-dlp.
• Content Script Injection: youtubeContentScript.js extracts video IDs and requests transcripts from the backend.
• Badge Notification: A browser action badge indicates successful transcript retrieval.

Changes Made

• Added a new API endpoint in server.py to handle transcript extraction.
• Updated background.js to include a context menu for YouTube video pages.
• Implemented youtubeContentScript.js to interact with YouTube pages and fetch transcripts.
• Updated manifest.json to include necessary permissions.

How to Test

1. Load the extension in Developer Mode.
2. Navigate to a YouTube video page.
3. Right-click and select "Generate Quiz from YouTube Video".
4. Verify that the transcript is extracted and displayed in the extension UI.

Webcast

youtube_context_demo.mp4

Checklist

• Tested manually on different YouTube videos.
• Proper error handling added for missing captions.

Related Issues

Fixes #190

[Aditya062003]

Looks good to me! we've always needed integrations with other platforms.