[WIP] Add option to upload video or paste YouTube link

[Copilot]

Implementation Plan: Add YouTube Link Support

• Add yt-dlp library to requirements.txt for YouTube video downloads
• Update backend (app.py) to handle both file uploads and YouTube URLs
  • Add new endpoint or modify /upload to accept YouTube URLs
  • Add function to download YouTube videos using yt-dlp
  • Process downloaded videos same as uploaded files
• Update frontend (index.html) to add option for YouTube URL input
  • Add toggle/tabs to switch between file upload and YouTube URL
  • Add input field for YouTube URL
• Update frontend JavaScript (app.js) to handle YouTube URL submission
  • Detect which input method user selected
  • Send appropriate data to backend
• Update CSS (style.css) to style the new YouTube URL input option
• Test the implementation manually with both upload and YouTube URL
• Take screenshot of UI changes

Original prompt

Give the users an option to either upload the video or paste a youtube link of the video

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